i am cleaning alot of my suspension and drivetrain parts with Hydrochloric Acid (and alot of knowledge, attention and equiptment) before getting them powdercoated and such. the biggest problem is how to rinse off all the acid and protect them before the rust starts, which is almost immediately. if i were going to dip my car i would most certanly request to see the process and make sure that they could coat all the hard to reach places. if i could be certain of the process i would definately get it done.