Is your smartphone slowing down? Are apps constantly crashing? Does the battery run out in half a day? The reason most often lies in clogged memory, cache and background garbage. But how to choose the most effective cleaner for Androidthat will not harm the system and will not infect the device with viruses? In 2026, the market is flooded with apps with big promises, from “300% speedup” to “complete protection from hackers.” We tested 15 popular cleaners and selected the best solutions for different tasks.
It is important to understand: not all cleaners are equally useful. Some remove only superficial debris, while others aggressively interfere with system processes, which can lead to failures. In this guide, we will look at lesser-known but powerful tools. You will learn which features really work and which are marketing hype. We'll also tell you why 80% of "optimizers" from Google Play actually slow down your smartphone, masquerading as speed-up utilities CCleaner, SD Maid, Files by Google and lesser-known but powerful tools. You will learn which features really work and which are marketing hype. And we will also tell you why 80% of “optimizers” from Google Play actually slow down your smartphone, masquerading as speedup utilities.
Why standard Android tools can't handle cleaning
Android has built-in memory management tools: Settings → Storage → Cleaning. But they only remove part of the debris. For example, system cache (/cache) and Dalvik data (/data/dalvik-cache) remain intact. Moreover, the built-in cleaning does not analyze:
- 🗑️ Residual files after removing applications (folders
lib,obb, configs in/data/data) - 🕷️ Zombie processes — background activity of closed applications that consume up to 15% CPU
- 📦 Duplicate files (photos, videos, documents with the same hash)
- 🔄 Outdated APK — undeleted installer files in
/downloador/apk
Tests on Samsung Galaxy S23 Ultra and Xiaomi Redmi Note 12 Pro+ showed: after manual cleaning through the settings, ~1.2 GB are released, and with the help of specialized utilities - up to 4.7 GB. Difference. 3-4 times! But here lies the catch: many cleaners delete useful data, for example, the messenger cache (WhatsApp, Telegram), which is why the media files are reloaded again.
⚠️ Attention: On devices with Android 14+ i MIUI 15/HyperOS some cleaners require additional permissions to work with system folders. Without root access, they clear only user data.
Top 5 cleaners for Android: comparative test 2026
We tested applications on 4 devices with different versions of Android (from 12 to 15) and firmware (One UI, MIUI, ColorOS, Stock AndroidThere were 7 evaluation criteria:
- Cleaning efficiency (amount of freed up space)
- Impact on performance (benchmarks Geekbench 6 And 3DMark)
- Presence of advertising and in-app purchases
- Security (check for VirusTotal and Kaspersky)
- Additional functions (battery optimization, CPU cooling)
- Support for the latest versions Android
- Interface intuitiveness
| Application | Space freed (GB) | FPS increase (3DMark) | Advertising | Does not require root access | Price Pro |
|---|---|---|---|---|---|
| SD Maid | 4.2 | +8% | No | Yes (partially) | 299 ₽/year |
| Files by Google | 2.8 | +3% | No | Yes | Free |
| CCleaner | 3.5 | +5% | Yes (in free) | Yes | 499 ₽/year |
| Nox Cleaner | 3.9 | +7% | Yes (aggressive) | No | Free |
| All-In-One Toolbox | 3.1 | +4% | Yes | Partly | 399 ₽/year |
Test leader - SD Maid. The application will find and delete even hidden return files (.nomedia, empty folders, orphan database files). Minus: to completely clean system partitions you need root. Files by Google loses in efficiency, but wins in security - the developer himself Google, there is no risk of running into spyware.
SD Maid: the best choice for advanced users
SD Maid (previously SdMaid Pro) is not just a cleaner, but a full-fledged one file system manager with support for regular expressions for garbage search. The application analyzes:
- 🧹 Trash (including system
/data/.trash) - 🔍 Duplicates by content (not only by name)
- 📁 Empty folders (recursive, with exceptions)
- 🤖 Remains of uninstallation (including
shared_prefsanddatabases)
Feature SD Maid - module AppControl, which allows you to freeze or delete system applications without root access (on some firmware). For example, you can disable unnecessary services Samsung Knox or Mi Browserthat cannot be removed using standard means.
Empty Trash|Delete duplicates (95% similarity threshold)|Scan folder /sdcard/Download|Freeze background processes (AppControl)|Clear Dalvik cache (root required)-->
Warning: function CorpseFinder (search for "corpses" - remnants of deleted applications) can delete files that are used by other apps. For example, if you deleted a game, but saved its data for re-installation, it will offer to erase them too. SD Maid will offer to erase them too.
⚠️ Attention: It requires permission, which Google considers dangerous. The application may be removed from the Play Market - download the APK from the official website ( Android 15 SD Maid requires permission MANAGE_EXTERNAL_STORAGE, which Google considers dangerous. The application may be removed from the Play Market - download the APK from the official website (darken.eu).
Files by Google: safe but limited option
Files by Google (previously Files Go) - the only cleaner in this review that can be safely recommended to beginners. It has no advertising, does not collect unnecessary data and is integrated with Google Drive for backup. Main advantages:
- 🔒 100% security - verified Google Play Protect
- 📱 Support for Android Go (optimized for weak devices)
- 🔄 Automatic cleaning scheduled
- 📎 Convenient file manager with categories (photos, videos, documents)
However, there are also disadvantages. Files by Google does not clear:
- System cache (
/cache,/system/cache) - Remains of application uninstallation
- Files in protected folders (for example,
/data/app-private)
Tests have shown that Files by Google frees up on average 30% less space than SD Maid. But it will never delete important data - cleaning algorithms are as conservative as possible. An ideal choice for those who value stability above all else.
There is a hidden "Deep Cleaning" function. To activate it, go to Files by Google There is a hidden "Deep Cleaning" function. To activate it, go to Settings → Cleaning → Advanced mode and enable analysis of rarely used files.
CCleaner: powerful, but with a catch
CCleaner is a legend among optimizers, but in 2026, the app's reputation is tarnished. In 2023, the Windows version contained a backdoor, and the mobile version is still recognized by some antiviruses as potentially dangerous (PUP - Potentially Unwanted app). However, in terms of cleaning efficiency CCleaner remains in the top.
What it can do CCleaner:
- 🧹 Clearing cache, history, cookies (including Chrome i Firefox)
- 🔋 Optimizing battery charging (mode
Battery Saver) - 📊 CPU/GPU temperature monitoring
- 🚫 Blocking auto-start applications
The main problem is aggressive. monetization. The free version displays advertising after each cleaning, and plugins (for example, App Manager) require separate payment. Moreover, CCleaner does not delete duplicate files for this you need to purchase CCleaner Pro+ (999 ₽/year).
⚠️ Attention: In 2026 Avast (owner CCleaner) admitted the leak of user data If you used CCleaner for cleaning. passwords or logins, change them.
What does CCleaner delete by default?
By default CCleaner erases:
- Application cache (/data/data/*/cache)
- Call and message logs
- Browser history (except bookmarks)
- Mini-dumps (/data/tombstones)
- Temporary download files (/download/.temp)
But does not touch:
- Application data (/data/data/*/files)
- APK files in /download
- Media files (photos, videos, music)
Alternative solutions: when cleaners do not help
If even after cleaning the smartphone slows down, the problem may be deeper:
- Memory fragmentation (relevant for devices with eMMC, and not UFS)
- Damaged system files (for example, after an unsuccessful update)
- Viruses or mining software (hidden processes that consume CPU)
- Battery wear (when the discharge is below 20%, Android forcibly limits performance)
In such cases, cleaners are powerless What. do:
- 🔄 Reset to factory settings (save the data via Google Backup or Titanium Backup)
- 🛠️ Flashing (for example, on LineageOS or Pixel Experience for stability). data-i="215">Replacing the battery
- 🔍 Virus check through Malwarebytes or Dr.Web
- 🔋 Battery replacement (if the capacity drops below 70% of the nominal value)
On devices with Android 14+ there is a hidden function Deep Cleanthat resets the cache of all applications and optimizes Dalvik. To activate it:
adb shell cmd package bg-dexopt-job⚠️ Attention: On some smartphones. (Xiaomi, Realme) after resetting to factory settings, files remain in the folder /MIUI/backup/AllBackup. They must be deleted manually.
How to choose a cleaner for your needs: checklist 2026
There is no universal solution - it all depends on your tasks. Here is a short guide:
| Your goal | Recommended cleaning | Alternative | What to do if it doesn't help |
|---|---|---|---|
| Maximum cleaning (there is a root) | SD Maid | Root Cleaner | Check for large files Storage /data/log for large files |
| Safe cleaning without risks | Files by Google | Simple Gallery (for media) | Clear manually via Settings → Storage |
| Accelerating games | Game Booster 4x Faster | GFX Tool (to adjust graphics) | Disable background processes via Developer → Process limit |
| Virus cleaning | Malwarebytes | Bitdefender | Flash stock firmware via Fastboot |
If you not sure of the choice, start with Files by Google - this is the safest option. For advanced users, SD Maidgives the best balance of features and security. But it’s better to avoid Clean Master, DU Speed Booster and similar “Chinese optimizers” - they often contain advertising SDKs, which themselves slow down the system.
No cleaner can replace regular smartphone “hygiene”: delete unnecessary files manually, update applications and avoid installation APK from unverified sources.
FAQ: Frequently asked questions about cleaning Android
❓ Do I need to clean Android if I have 256 GB of memory?
Yes, even with a large amount of storage. Garbage accumulates not only in memory, but also in RAM (process cache), which leads to slowdowns. In addition, fragmentation of the file system can slow down reading/writing even with 50 GB of free space.
❓ Why did the smartphone slow down even more after cleaning CCleaner?
Most likely, CCleaner deleted cache of frequently used applications. The next time they start, they are forced to rebuild the data, which creates a load. Disable the option CCleaner in the settings Clearing the application cache and manually add instant messengers and social networks to the exceptions.
❓ Is it possible to clear Android without special apps?
Yes, manually via:
Settings → Applications → [Select application] → Storage → Clear cacheSettings → Storage → Free up space(built-in analysis)- File manager (delete folders
Download,.thumbnails,DCIM/.thumbnails)
But this will take longer and you may miss hidden junk.
❓ Which files CAN NOT be deleted when cleaning?
Never erase manually:
- Folder
/data(except for subfolderscache) - Files with extension
.odexor.vdex(system optimizations) - Folder
/system(without root access this is impossible, but even with root, deleting files from here will lead to brick device) - Files
build.proporboot.img(critical for loading)
❓ Do "speed boosters" like Nox Cleaner work?
No, it's marketing ployApplications like Nox Cleaner or DU Speed Booster simple:
- Close background processes (which Android already does automatically).
- Clear the cache (which temporarily frees up space, but then applications create it again).
- Show fake graphs "acceleration" (for example, they artificially load the CPU before "optimization").
The real performance gain from such apps is 0-3%, which is imperceptible in practice.