yesterday i was on my son's tablet (galaxy tab) and a window popped up warning us that there may be some viral apps downloaded and recommended using an app cleaner. so i browsed the play store and downloaded Clean Master and installed it and let it do its thing. so i thought, why not put it on my S3? is this a wise choice? will it help or hurt? i'm not too phone savvy and i let it do its thing on my phone. any advice?