I don't know whether you want to do it yourself or send it out, but I came across this company in a thread about acid dipping.
It's called Nor-Cal Metal Stripping. It's in California
Address: 10010 OLD REDWOOD HWY
Windsor CA
tel # 707-838-9470
The guy in the thread said it's just north of Santa Rosa right on 101
Don't know if this will help you but it may be a start