Cleaning the underside of my dart

Gents & Ladies of A-bodies:
Does anyone have any suggestions for effective products to use to clean off 37 years of grime from the underside of my 1971 Dart? I think I read (possibly on this site) about using oven cleaner to get the dirt off metal parts.
I do not have a pressure washer, but perhaps this is a project to justify to My Bride purchasing one...
Ideas and thoughts?
Author: admin