Removing Undercoating
 

What's the best stuff for removing undercoating from paint?? other than elbow grease..

media blaster
acid dipping

try Knee grease. :)

depending on how old it is and brittle it is, it can come off pretty easy by picking at it or a high pressure washerif it's under the chassis.

if it's its on the paint, maybe try some bug and tag remover.

it's on the paint and is a sticky goo

Lots of rags and some simple green or any other de-geaser. Elbow grease is the only way. A pressure washer will get off the bigger chunks, but you still gotta use a whole lot of elbow grease.