There are some places that promise miracle cures for even blood tests. But, most cleaning systems aren't reliable, and only exist to fool desperate people into handing over their money. There are hundreds of web pages out there dedicated to beating a urine test, and after doing some searching, I can't find a single site with information about how to beat a blood test, aside from folks trying to hawk their magical potions. If there was a good way to beat a blood test, it would probably not be so difficult to find.