How to completely clear memory on Android: from cache to system garbage

Clogged memory on a smartphone is a problem that every second user faces. Android. The device starts to slow down, applications crash, and the system issues annoying notifications about lack of space. But clearing memory isn't just about deleting photos or old games. Hidden under the “garbage” are gigabytes of cache, remnants of deleted applications, duplicate files, and even system data that can be safely deleted.

In this article we will examine 7 proven ways memory cleaning - from basic (for beginners) to advanced (for those who are ready to delve into the settings). You will learn how to free up space, which files can be deleted without risk, and which files should not be touched. We will pay special attention to hidden memory “eaters” - for example, without losing important data, which files can be deleted without risk, and which ones should not be touched. We will pay special attention to hidden memory “eaters” - for example, APKfiles of remaining updates or cache Google Play Serviceswhich can weigh several gigabytes.

Before you begin, check how much space is actually occupied: go to Settings → Storage. The system will show the distribution of memory by category - this will help you understand what to focus on. If less than 10% of the total volume is free, the device will start to work slower due to data fragmentation.

1. Removing the application cache: a quick way to free up 1-5 GB

Caches are temporary files that applications create to speed up work. Over time, they accumulate and can take up to 20% of memory. For example, the cache YouTube or TikTok easily grows to 1–2 GB, and Google Play Services up to 500 MB or more.

You can clear the cache in two ways:

• 📱 For one application: go to Settings → Applications → [application name] → Storage → Clear cache. This is safe - the application will simply cache the data again the next time it is launched.
• 🧹 For all applications at once: in Settings → Storage → Cache data click "Clear." On some firmware (for example MIUI or ColorOS) this item may be called "Junk Cleanup".

Important: do not confuse "Clear cache" and "Clear data" - the second will delete all application settings (logins, game saves, etc.)! If after clearing the cache the application began to work slower, just restart it - the system will restore the necessary files.

⚠️ Attention: On some devices (for example, Samsung s One UI) clearing the cache through the storage menu can reset widget settings on the home screen. Before mass clearing, take a screenshot of the location of the widgets.

2. Removing unnecessary applications and their remnants

Even after deleting, applications often leave behind “tails”: folders in /Android/data, settings files or cache. For example, a game Genshin Impact after uninstallation can leave up to 3 GB of data in the folder. com.miHoYo.GenshinImpact.

How to delete applications and their remains:

• 🗑️ Standard removal: press the application icon on the main screen → "Delete" (or drag it to the trash). On some firmware you need to go to Settings → Applications and select "Delete".
• 🔍 Search for leftovers: use a file manager (for example, Files by Google or Solid Explorer) and manually check the folders:

  /storage/emulated/0/Android/data/
  /storage/emulated/0/Android/obb/

  Delete folders with the names of deleted applications (for example, com.faceapp).

• 🤖 For root users: applications like SD Maid or Root Cleaner will find and delete system garbage, including uninstallation residues.

Some manufacturers (for example, Xiaomi or Huawei) block the removal of pre-installed applications. In this case, you can disable:

1. Go to Settings → Applications.
2. Select an unnecessary application (for example, Mi Browser or Huawei AppGallery).
3. Click "Disable" - it will disappear from the menu and stop updating.

⚠️ Attention: Do not delete system applications with rights android.uid.system (for example, Android System WebView or Google Play Services). This may cause the system to crash. If you are not sure, check the name of the application on Google before deleting.

3. Cleaning up downloads, duplicates and old files

Folder Download is a real dump: files, memes, documents and archives that you have long forgotten accumulate here. And the smartphone often creates duplicate photos (for example, when editing in APK-files, memes, documents and archives that you have long forgotten. And the smartphone often creates duplicate photos (for example, when editing in Google Photos or Snapseed).

How to find and delete unnecessary files:

• 📁 Downloads folder: open any file manager and go to /storage/emulated/0/Download. Sort files by date and delete everything older than 3-6 months.
• 🔄 Duplicate photos: use applications like Files by Google (Cleaning tab) or Duplicate Files FixerThey will find duplicate images, including with different ones. resolution.
• 🎵 Unused music and video: check folders Music, Movies and DCIM/.thumbnails (thumbnails are stored here, which can be safely deleted).

If you are afraid of deleting something important, transfer the files to your computer or to the cloud (Google Drive, Yandex Disk) before cleaning. For convenience, you can archive rarely used data:

1. Select the files in the manager.
2. Click "Compress" (or "Archive").
3. Move the archive to the cloud or to an SD card.

4. Transferring data to an SD card or to the cloud

If there is a serious lack of memory and you don’t want to delete anything, transfer the files to an external storage device:

• 💾 SD card: suitable for photos, music and some applications (if supported Adoptable Storage). On modern Android (10+), transferring applications to the card is often blocked.
• ☁️ Cloud storage: Google Photos (unlimited space for compressed photos), Yandex Disk (10 GB free), Mega (20 GB with registration).
• 🖥️ Local storage: transfer files to a computer or external SSD via MTP (data transfer mode when connected via USB).

How to transfer files to an SD card:

1. Open the file manager.
2. Select files → "Move".
3. Select the SD card as the destination.

For cloud services:

• Install the application (Google Photos, Yandex Disk etc.).
• Enable auto-upload of photos in the settings.
• Manually upload the remaining files through the interface applications.

Storage method	Pros	Cons	Access speed
SD card (Class 10/UHS-I)	Cheap solution, works offline	May break, limited resource of records	Average
Google Photos (compressed quality)	Unlimited space, automatic synchronization	Photo quality is reduced, internet required	Depends on network speed
Yandex Disk / Mega	Free space, encryption (in Mega)	Upload/download limit	Slower local
External SSD + OTG adapter	Large volume, high speed	Expensive, you need to wear an adapter	High

⚠️ Attention: On some devices (for example, Samsung Galaxy s One UI), transferring applications to an SD card can lead to their unstable operation. Before transferring, check reviews about the compatibility of your model.

5. Cleaning system garbage and optimizing storage

Android creates a lot of service files that are not visible to the user, but take up space. This is:

• 🗃️ Remaining updates: folder /cache and files of the form update.zip at the root of the storage.
• 📱 Dalvik-cache data: virtual machine cache Androidwhich can only be cleared with root-access.
• 🔄 Logs and dumps: files with the extension .log or .dmp in folders /data/log or /sdcard/logs.

How to clean up system garbage:

1. Without root: use built-in tools, for example:

   Settings → Storage → Free up space

   On Xiaomi this is called "Deep cleaning", on Samsung - "Storage optimization".

2. With root: install SD Maid or Root Cleaner and run a scan for system garbage.
3. Manually: via a file manager with root access, delete the contents of the folders:

   /data/local/tmp
   /cache
   /data/log

Another hidden memory "eater" - Chromium files (Chrome, Edge, Brave). They store the cache and site data in the folder /data/data/com.android.chrome/app_chrome/Default. You can clear them through your browser settings:

1. Open the browser → ⋮ → History → Clear data.
2. Select "Cookies and site data" + "Cached images".
3. Set the period to "All time" and click "Delete".

What is dalvik-cache and can it be deleted?

Dalvik-cache These are optimized versions of applications for virtual cars Dalvik (or ART in new versions Android). Manually deleting it is not recommended as the system will restore it the next time you launch applications, but it may free up 100-500MB temporarily. To clean, use specialized utilities like SD Maid with the "Dalvik Cache Cleaner" option.

6. Resetting to factory settings: a last resort

If none of the methods helped, and there is critically little free space, there remains hard reset (reset to factory settings). This will delete all dataincluding applications, settings and files, but will return the device “clean” as after purchase.

How to reset:

1. Create a backup copy of important data (contacts, photos, messages).
2. Go to Settings → System → Reset settings.
3. Select "Delete all data" (or "Reset to factory settings").
4. Confirm the action and wait until the reboot.

After the reset:

• 🔄 Restore data from backup (for example, via Google Account or Titanium Backup for root users).
• 📱 Install only necessary applications - this will help avoid refilling memory.
• 🛡️ Configure automatic cache clearing (some firmware has this option).

⚠️ Attention: On devices with encryption (File-Based Encryption, used on Android 10+), the reset may take up to an hour. Do not interrupt the process, even if the screen goes dark - this will lead to a “brick” (inoperability) of the device.

7. Prevention: how to avoid memory filling in the future

In order not to clear the memory every week, set up preventive measures:

• 📈 Auto-cleanup cache: in Files by Google turn on the "Junk Cleanup" option with notifications.
• ☁️ Auto-upload photos to the cloud: to Google Photos activate "Backup and synchronization".
• 🚫 Limit background activity: to Settings → Applications → [name] → Battery limit background work for unnecessary applications.
• 🔄 Regular check: open once a month Settings → Storage and delete unnecessary files.

It is also worth giving up the habit of storing on your phone:

• 🎬 Several seasons of TV series (download one episode).
• 🎵 Full music albums (use streaming services like Spotify or YouTube Music).
• 📄 Archives of documents older than a year (transfer them to the cloud).

If your device supports MicroSD, buy a class card A2 (optimized for applications) and set up saving photos/videos to it by default. This will eliminate the need to clean the internal memory.

FAQ: Frequently asked questions about clearing Android memory

Is it possible to clear the Android/obb folder? Will this harm the games?

Folder Android/obb contains additional data for games and applications (for example, graphics or levels). If you delete files from it, games may stop launching or require re-downloading data Delete only files of games that you have already deleted from the device.

Why, after clearing the cache, does the memory fill up again after a day?

Caches are temporary files, and applications recreate them when used. If the memory fills up quickly, check:

• 📱 Applications that actively use the cache (social networks, instant messengers, streaming services).
• 🔄 Auto-cleaning settings - they may be disabled.
• 📈 Background activity of applications (in settings batteries).

For social networks (for example, Instagram or TikTok), you can limit the cache manually: in the application settings, set the limit (if such an option exists).

How to clear the memory if the phone does not turn on (freezes on the logo)?

If the device does not boot, try:

1. Recovery mode: hold down the combination of buttons (usually Power + Volume Up) when turning on, then select Wipe Cache Partition.
2. Connecting to a PC: if the phone is detected as a drive in mode MTP, copy important files and format the memory.
3. Fastboot: for advanced users - via fastboot erase cache or fastboot format userdata (erases all data!).

If nothing helps - take the device to a service center.

Is it true that clearing the memory speeds up the phone?

Partially. Freeing up 10–15% of memory can improve performance, since the system needs space for background processes. However, if the lags are caused by a weak processor or outdated firmware, cleaning will not have a noticeable effect. To speed up it is also worth:

• 🔄 Disable animation in Settings → About phone → Build number (press 7 times, then in Settings → System → For developers set animation to 0.5x).
• 🗑️ Remove widgets from the home screen (they consume RAM).
• 🔋 Calibrate the battery (if the phone suddenly turns off).

Which applications clean best memory?

Standard tools Android usually sufficient, but if you need additional functions, try:

• Files by Google — simple interface, clearing duplicates.
• CCleaner —deep cleaning of cache and history.
• SD Maid (requires root) - removal of system garbage.
• Droid Optimizer - optimization of memory and battery.

⚠️ Attention: Some "optimizers" (for example, Clean Master) may show false notifications about viruses or garbage. Use only trusted applications from Google Play.