Is your smartphone Android slow, although there seems to be enough free memory? It's not just about visible files - the system and applications leave behind tons of hidden garbage that eats up space and slows down work. Unlike visible photos or videos, this garbage is hidden in system folders, caches and remnants of deleted apps. It is not visible in the standard file manager, but it takes up gigabytes of memory and can cause crashes.

The problem is that Android does not always clear temporary files correctly. For example, after uninstalling an application, its settings and cache often remain in memory. And system updates leave backups that are never deleted automatically. In this article we will show where exactly to look for garbage from obvious places like the browser cache to hidden folders that are not even talked about in official instructions.

1. Application cache: why it is not enough to clear it through the settings

The most obvious place where garbage accumulates is application cache. But standard cleaning via Settings → Applications → [Select application] → Memory → Clear cache deletes only part of the temporary files. Many apps (especially social networks and instant messengers) store data in separate folders that are not affected by this command.

For example, Facebook and Instagram download media files to the folder /Android/data/com.facebook.katana/cache/ and /Android/data/com.instagram.android/cache/ respectively. These files can weigh several gigabytes, but remain invisible to the user. And applications like Google Maps or Yandex.Navigator caching maps in separate directories, which are also not cleared by standard means.

  • 📁 Where search: Folder /Android/data/ → folders with the names of application packages (for example, com.whatsapp, com.vk.android).
  • 🔍 How to clear: Manually through the file manager (you need rights root for some folders) or using SD Maid, Files by Google.
  • ⚠️ What not to touch: Files with the extension .dat or .db is application databases. Deleting them can reset the settings.
⚠️ Attention: Some applications (for example, banking) block access to their folders through standard managers. To clear them, you will need either rootor reinstalling the app.
📊 How often do you clear the cache on Android?
Once a week
Once a month
Only when memory runs out
Never

2. Download folder: why does it take up space? gigabytes, although you didn’t download anything

Folder /Download/ (or /Downloads/ on Russian-language firmware) is a black hole for unnecessary files. The following are automatically saved there:

  • 📄 Documents from Telegram, WhatsApp, Viber (even if you did not open them).
  • 🎵 Music and podcasts from YouTube Music, Spotify (if offline playback is enabled).
  • 📦 APK files from browsers (for example, after downloading applications from sites like data-i="84">. And after updates, old APK files remain for years, occupying 50–100 MB each. APKMirror).
  • 📎 Attachments from mail (Gmail, Yandex Mail) — PDF, XLS, DOC.

The problem is that many of the files here are duplicated. For example, the same video from Telegram may also be in the messenger folder (/Android/media/com.telegram/), and in /Download/. And after updates, old APK files remain for years, occupying 50-100 MB each.

File type Where it comes from How much it can weigh Can it be deleted
APK files Downloading applications outside Play Market 50–200 MB per file Yes, if the application is already installed
Sound files (.mp3, .m4a) Offline music, voice messages 3–10 MB per track Yes, if you don’t need offline
Documents (.pdf, .docx) Attachments from mail/messengers 1–50 MB per file Yes, if there are copies in the cloud
Images (.jpg, .png) Screenshots, memes, pictures from chats 0.5–5 MB per file Yes, if not needed

The folder /Download/ often contains files with the extension .crdownload —these are undownloaded files from Chrome or others browsers. They take up space, but are useless, since the download was interrupted.

3. Remains of deleted applications: why they remain and how to find them

When you delete an application through Settings → Applications, Android leaves after it:

  • 🗃️ Data folders in /Android/data/[application_package]/ and /Android/obb/[application_package]/.
  • 📝 Settings files in /data/data/[application_package]/ (access rights are required). root- access rights).
  • 🔗 Symbolic links in /sdcard/Android/media/ (for example, for games).

Games leave a lot of garbage, for example. Genshin Impact or Call of Duty Mobile after uninstallation they can leave /Android/obb/ files weighing 1–2 GB. And applications like Adobe Photoshop Express or Lightroom store a cache of edited photos in hidden folders.

⚠️ Attention: Some applications (for example Netflix or Disney+) save downloaded videos in encrypted form. You can delete them only through the settings of the application itself, otherwise the files will remain in memory as broken.

Delete via Settings → Applications

Check the folder /Android/data/[application_package]

Check the folder /Android/obb/[application_package]

Clear the browser cache if the APK was downloaded through it

Reboot the device-->

4. System cache and /cache folder: what can be deleted and what cannot

Folder /cache/ (not to be confused with the application cache!) contains temporary system files, including:

  • 🔄 Firmware updates (files update.zip or OTA-*.zip).
  • 📱 Recovery data (for example, after resetting to factory settings).
  • 🛠️ Error logs (.log, .txt s dumps).

These files are usually not visible without rootrights, but they can be cleared through recovery mode (Recovery Mode). data-i="155">Turn off the phone.

  1. Turn off your phone.
  2. Hold Volume up + Power (key combination depends on the model).
  3. To menu Recovery select Wipe cache partition.
  4. Restart the device.

Do not confuse Wipe cache partition (safe) with Wipe data/factory reset (full reset!). The first option deletes only temporary files without affecting user data.

What happens if you delete the system cache manually?

Forced deletion of files from /cache without Recovery can lead to a cyclic reboot (bootloop) if critical data for booting the system is erased. Always use standard cleaning methods.

5. The /DCIM/.thumbnails folder: why is it occupied. gigabytes

The folder /DCIM/.thumbnails/ Android stores thumbnails for quick loading of the gallery. It would seem like a small thing - but if you have thousands of photos, this folder can grow to 1–3 GB. Moreover, thumbnails are often duplicated: some are created by the system, others by applications like Google Photos or Gallery from the manufacturer.

The worst thing is that these files are not deleted automaticallyeven if the original photos have long been erased. Moreover, some applications. (for example, WhatsApp) create their thumbnails in separate folders (/WhatsApp/Media/.thumbnails/), which also need to be cleaned separately.

💡

If after cleaning .thumbnails The gallery takes a long time to load when first opened - this is normal. The thumbnails will be generated again, but now they will be relevant.

6. Multimedia garbage: where duplicates and unnecessary files are hidden

Multimedia files are the main memory hog. But we’re not just talking about your photos and videos, but about:

  • 🎥 Screenshots and screen recordings in /Pictures/Screenshots/ i /Movies/Screenrecords/.
  • 📸 Photos from messengerswhich are automatically saved in /WhatsApp/Media/, /Telegram/Telegram Images/.
  • 🎶 Offline music cache (Spotify, VK Music, YouTube Music).
  • 📺 Downloaded videos from TikTok, Likee, Kwai (often in low quality, but in large quantities).

The most insidious folder is /Android/media/. Many applications put media files there that are not displayed in the gallery, but take up space. For example, TikTok stores downloaded effects and templates here, and Snapchat temporary snapshots.

Application Junk folder What lies there Can I delete
TikTok /Android/media/com.zhiliaoapp.musically/cache/ Video effects, preview videos Yes
Snapchat /Android/media/com.snapchat.android/cache/ Pictures, stories, filters Yes, but saved images may be lost
VK /Android/data/ru.mail.vk/cache/ Audio, video from feed Yes
Google Maps /Android/data/com.google.android.apps.maps/cache/ Maps for offline viewing Yes, if not needed offline
💡

Many applications save media files in hidden folders that are not displayed in the standard gallery. Use a file manager with a function to show hidden files (for example Solid Explorer or FX File Explorer).

7. Logs and dumps: why they eat up memory and can they be deleted

The system and applications constantly create logs (.log, .txt, .dmp) for debugging. Under normal conditions, they weigh not enough, but if the phone has software errors or it rooted, these files can grow to hundreds of megabytes. Where to look for them:

  • 📜 /data/anr/ - application freeze logs (ANR — Application Not Responding).
  • 📜 /data/tombstones/ — crash dumps (requires root-rights).
  • 📜 /sdcard/bugreports/ — error reports created manually.
  • 📜 /data/log/ — system logs (available only with root).

These files can be deleted, but they will appear again the next time there is a failure. If the logs constantly take up a lot of space, this is a sign problems with the firmware or of an application conflict. In this case, resetting to factory settings or flashing the firmware will help.

⚠️ Attention: Deleting files from /data/ without rootrights can cause the system to crash. To clean, use specialized utilities like Logcat Cleaner (requires root).

FAQ: Frequently asked questions about garbage in Android

Is it possible to clear the cache of all applications at once without going into each?

Yes, but not through standard settings. Use:

  • Applications like SD Maid or CCleaner (you need superuser rights for deep cleaning).
  • Command via ADB: 
    adb shell pm trim-caches 256m

    (clears the cache up to the specified limit, here - 256 MB).

There are no standard means for mass clearing the cache in Android no.

Why after Clearing memory through "Settings → Memory" does not free up space?

The standard tool Storage & Performance in the settings deletes only:

  • The cache of some applications.
  • Temporary download files.
  • Trash from the trash.

It does not touch:

  • Remains of deleted applications.
  • System cache (/cache/).
  • Hidden folders of instant messengers and social networks.

For deep cleaning, use a file manager with access to hidden folders.

How to find the largest files on Android without a computer?

Install one of these applications:

  • Files by Google —shows large files and suggests deleting them.
  • DiskUsage —visualizes occupied space by folders.
  • Storage Analyzer —sorts files by size.

All of them work without rootrights, but access to some system folders may require additional permissions.

What to do if, after cleaning up the garbage, the phone begins to work slower?

This is normal in the first hours after cleaning, because:

  • Applications need to re-create the cache.
  • The system re-indexes the files for search.
  • The gallery generates thumbnails again.

If the lags persist longer days:

  • Check whether you have deleted critical files (for example, from /data/data/).
  • Restart the device.
  • If the problem persists, reset the cache via Recovery Mode.
Is it possible to clear the /Android/obb/ folder without deleting games?

No. The folder /Android/obb/ contains main game data (graphics, levels, sounds). Clearing it is equivalent to deleting the game. However, you can:

  • Delete game files that are already have not been using it for a long time.
  • Transfer the contents to an SD card (if supported).
  • Use Google Play Games to synchronize progress and reinstall games if necessary.