Here is the Link Don't mind the bad reviews, it really is a good auto tapper. There is, however, a premium version. The free version only gives you about 30 seconds of ~50 taps per second, until you have to press a button again. The premium version will give you ~50 taps per second forever, once you press a button. Hope this helps! EDIT: I believe the premium version is $2 to $3. (£1.53 to £2.29)
I'd reccomend tou scanning your tablet regularly. Here are two apps I use on my tablet, they are for android but if you have iPad I'm sure there are some replacements:
For SD Maid, Corpse Finder, System Cleaner and Databases should be enough.