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Take a look at the below list to find Android cleaner apps that actually work, without stealing your data or compromising your privacy. Here is an excellent post on why you should avoid using them. If you know which apps you want to delete, head into Settings > Apps and notifications > Show all apps for Android 8 (or Settings > Applications > Application Manager for Android 7). Killing running tasks can also hamper the way apps function. The RAM cleaning part of those apps is useless, while and take up even more resources while doing so. Those tasks will simply restart after a few seconds.
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While that does free up memory, it is only temporary. By using Booster & Antivirus, you will see how your device increases its speed, thanks to the cleaning of junk, residual and cache files that do. They come with a feature called Tasks Killer, RAM booster, etc. It checks all the basics like junk files, cache, logs, RAM, duplicates, and more. There are plenty of space cleaner and memory booster apps in the Play Store (like Clean Master) that will kill existing running tasks. Ace Cleaner is one of the top and free solutions to optimize an Android phone. They have no regard for your data and privacy is an alien concept for the devs. However, most of these so-called cleaner apps (famously-terrible Cheetah Mobile) are filled with ads, malware, and virus. There are a number of Android cleaner apps that claim to remove junk files, clear cache files, increase space, and provide a host of other utility to the users.
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