Over time, any smartphone, even the most powerful flagship, begins to work slower. This is an inevitable process associated with the accumulation of temporary files, remnants of deleted applications and the system cache. Many users immediately run to the app store for so-called cleaners that promise “200% acceleration.” However, often such utilities themselves become the source of the problem, consuming RAM and showing intrusive advertising.
In fact, the operating system Android has a powerful built-in arsenal for self-service. In this article, we will look in detail at how to deep clean your device using only standard tools and a file manager. You will learn which folders can be deleted without fear, and which folders you absolutely cannot touch, so as not to disrupt the system.
Using the built-in maintenance tool
Modern shells from manufacturers, such as One UI from Samsung or MIUI from Xiaomi, already include optimizers. They are safe and can correctly terminate background processes. To access this function, you usually just need to go to the main settings of the gadget.
Find the section Device maintenance or Memory in the settings menu. The system will automatically analyze the current state of the drive and offer to delete unnecessary files. This method is the safest for beginners, since protection algorithms prevent the deletion of important system data.
However, it is worth understanding that the built-in tool often works superficially. It removes obvious garbage, but may miss old application logs or "tails" from long-deleted apps. For comprehensive cleaning, a manual approach to specific directories will be required.
Built-in cleaning tools are safe, but often do not remove the deep cache of instant messengers and the remains of deleted games.
Clearing the application cache manually
The most voluminous garbage is generated by social networks and instant messengers. Applications like Telegram, Viber or TikTok save every photo and video you view to local storage. Over time, this figure can reach tens of gigabytes, although you no longer need the files themselves.
To free up space, follow the path Settings → Applications. Select the most “heavy” application from the list and click on the item Storage. Here you will see two buttons: "Clear data" and "Clear cache". It is important not to confuse them.
Clicking on Clear cache will delete only temporary files without affecting your correspondence, logins and settings. This is a safe operation that can be performed regularly. But the “Clear Data” button will return the application to the state immediately after installation, deleting all your personal information.
In the Telegram messenger, it is better to use the built-in "Memory Usage" function in the settings of the application itself - it allows you to delete the cache with the setting to automatically delete old files.
⚠️ Attention: If you clear your banking application data, you will have to log in again and set up biometrics. Do this only if you are sure that you remember the password.
Working with the file manager and the Downloads folder
The folder Download (Downloads) is the most popular place for accumulation of digital trash. Documents from the browser, APK installation files that have already been used, and forgotten pictures from the Internet are automatically saved here.
Open a standard file manager, often called Files or My files. Go to the "Downloads" category. Review the list of files carefully. Often here you can find update installers from a year ago or advertising banners downloaded by mistake.
Pay special attention to files with the extension .apk. If an app is already installed on your phone, its installation file is no longer needed and takes up space. Feel free to delete them all, except those that you plan to install right now.
☑️ Check the Downloads folder
Searching and deleting hidden trash folders
Many applications create their own folders in the root of the internal memory. Even after uninstalling the app itself, these directories often remain as dead weight. They can store error logs, temporary sketches and configuration files.
In the file manager, enable the display of hidden files (usually this is an option in the "three dots" menu). Look for folders with the names of deleted applications. It is also worth checking the directory Android/data, but be extremely careful: deleting folders of active applications will reset their settings or lose progress in games.
There is a specific folder thumbnails, which is located along the path DCIM/.thumbnails. In it, the system stores thumbnails of all your photos for quick display in the gallery. Over time, this file can grow to gigabytes. It can be safely deleted - the system will create it again, but in a smaller size.
Why is the thumbnails folder growing?
The system generates previews for each photo and video. If you have thousands of high-resolution images, your thumbnail database becomes huge. Deleting this folder will speed up the gallery, but the first opening after cleaning will be slow until the thumbnails are recreated.
⚠️ Attention: Never delete folders with names
system,data(root) orobbentirely. This may cause the phone to stop booting or games to stop launching.
Analyzing space through settings
To understand what exactly is eating up your memory, use the built-in storage analyzer. In modern versions Android 11, 12, 13 and newer, this tool has become very visual. It shows the distribution of space by category: images, video, audio, applications.
Go to Settings → Memory (or Storage). Click on the category that takes up the most space. Often this turns out to be the “Other” or “Miscellaneous” section. This section may hide system update files that were not automatically deleted after installation.
If you see a file with a name like update.zip or similar, weighing several gigabytes, and the system is already updated, this file can delete. Also in this section there are often offline maps of navigators that you have not used for a long time.
| File type | Where to look | Can I delete? | Risk |
|---|---|---|---|
| Cache applications | Settings → Applications | Yes | Low (first launch slowdown) |
| File.thumbnails | DCIM/.thumbnails | Yes | Low (re-creation of thumbnails) |
| APK installers | Download folder | Yes | No |
| Android/obb folder | Internal memory | No | High (games will not start) |
| System logs | Memory root (log files) | Yes | Low |
The "Miscellaneous" category in the storage most often contains the cache of streaming services and offline maps, which take up the most space.
Resetting settings as a last resort
If manual cleaning did not help and the phone still works slowly, perhaps critical registry errors have accumulated in the system or file fragmentation has reached its limit. In this case, the only effective solution is a full reset to factory settings.
This procedure will delete absolutely all data from the device, returning it to the “as from the store” state. Before doing this, be sure to back up your contacts, photos and important documents to cloud storage or to your computer. Without backup, you will lose information forever.
To perform a reset, go to Settings → System → Reset settings. Select item Erase all data (factory reset). The process will take from 5 to 15 minutes depending on the speed of the flash memory of your device.
⚠️ Attention: Make sure that the battery charge is at least 50% before reset starts. If the phone turns off during the formatting process, restoring its operation will be extremely difficult and expensive.
What to do after the reset?
Do not restore all applications from Google backup at once. Install only the essentials manually. Often, old settings and cache are restored along with applications, reducing the benefit of resetting to zero.
Prevention and rules of digital hygiene
In order not to return to the issue of cleaning every two weeks, change your smartphone usage habits. Disable automatic saving of media files to the gallery for messengers. In the settings of WhatsApp and Telegram there are options that prohibit the downloading of pictures and videos automatically.
Regularly review the list of installed applications. If you haven't opened the app for more than a month, you probably don't need it. Removing unused software is the best way to prevent the accumulation of garbage in the future.
It is also recommended to restart your phone once a month. This is not just turning off the screen, but a complete redistribution of RAM and ending frozen system processes. A simple reboot can temporarily speed up your device without any complex manipulations.
Use the Digital Wellbeing feature in Android settings to keep track of which apps you use most often and promptly delete those that waste time and memory.
Is it safe to delete the Android folder?
No, you cannot delete the entire folder Android . It stores data from all installed applications. You can clear only specific subfolders inside Android/datarelated to already deleted apps, but this must be done manually and with understanding.
Why is there less space after cleaning?
This is a common illusion. After deleting large files, the system recalculates the free space. Sometimes the cache of system services (for example, Google Play Services) begins to actively grow immediately after clearing, filling the freed up space with new temporary files.
Do you need to clear the browser cache?
Yes, browsers store a lot of data to load sites quickly. However, clearing the browser cache will mean that the next time you visit your favorite sites, they will take a little longer to load, and you will be automatically logged out of some accounts.
How to clear the cache without root access?
All the methods described in the article work without root access. Obtaining root privileges for regular memory clearing is not required and may even void the device warranty or break banking applications.