Rhythm Software = Cheetah Mobile = Clean Master
all their products sucks bad, both from security point of view, as functional.
Since 1 year ago I help a friend to restore his iGO navigation software, screwed by CleanMaster, by deleting component files.
IMHO SD Maid is the best app for cleaning. Clean, never failed to screw installed apps and green from security point of view.
Working as a security consultant, I test thousands of Android apps (should I make a joke, all that was "published" on 4pda and Mobilism, was deeply checked by me
).
Same thing goes for all products from another chinese company GO: just hammer your firewall "crying" for various chinese IPs.
What more should I say: AVOID their products.