Clean Master - Some users swear by it, some call it a glorified snake oil that does more harm than good. That can be said about any snake oil, but what specific brand of snake oil can boast almost a billion downloads around the world?
Avast Cleanup - Next generation tuneup and cleanup for your PC
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
CleanMyMac X - Clean, protect and speed up your Mac
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
DU Speed Booster - DU Speed Booster is an essential Android app to accelerate phone speed, clean up junk files...