I'd be leary of anything site or tool that advertises VAC BAN Removal. The only true way to remove yourself from VAC BAN list would be to bypass various systems and gain access to their oracle db. Once there, you'd need to dump the tables for offline reviewing unless you had inside knowledge on where to look.
One particular tool I looked at... "VAC BAN Remover" asks for your steam u/p. Upon reviewing the internals of tool, found smtp code and gmail account information where your u/p is sent.
This should be common sense not to use such a tool, however some need to be warned! There are ways however to fool steam into jumping over the check(s) or fooling it into utilizing session of another non-banned game. Keep in mind that Valve is continuously updating their code and have started utilizing memory injection. A review of some logs show one particular tool "CODGateway" detected by the use of memory injection on a tool utilizing memory injection.