Hi asimov,
When you know your way around with scripts and want to study these cleansing routines enlist at one of the online bootcamps, like geekstogo. You are being taught until you can help under guidance and later you are able to help when you graduate as a qualified removal expert. We even have 2 teachers here (essexboy and oldman). During the time of your online studies you are not allowed to help with cleansing routines until you are qualified. Qualified Removal Expert is a status that is recognized everywhere and all over the Internet.
I am only helping these quys through support relevant knowledge as a volunteer website security analyst (cold reconnaissance third party scanning) and as a website error hunter. So I skim after outdated and exploitable scripts, server (mis)configurations, exploitable code, checking against regular expressions, obfuscating and de-obfuscating etc. etc.
after a decade of experience you can almost smell the ill code when going over some website source representation.
Hope you decide to fight for the benevolent forces and come to join us one day.
regards,
polonus