I was working on swapping roller rockers into the Mopar 4.7L stroker in the MJ and needed a new valve cover because my original aluminum one was cracked. I had heard of clearance problems with aluminum roller rockers and the factory aluminum valve cover, so I pulled a late model stamped-steel cover off an '00 in a junkyard. Before installation, I needed to purty them up a bit, so I grabbed my brush, my hose, and my Easy-Off and went to town.
You can see what my hand looked like 3 days later.