Bitmixer seems to be the general consensus answer for anything clearnet.  If you're looking for something on the TOR network (i.e. If you're REALLY paranoid about keeping your activities private), they actually have an onion-side site, as well (bitmixer2whesjgj.onion/ - you can verify by looking on their clearnet site).

There's also one called PayShield.  While I've never used it, it's run by the same person/people who provide SIGAINT (a highly trusted deep web email service), so I'm inclined to believe that they're trustworthy.

Just some ideas