I am with Paul you are over thinking the risk. Take the measures he has suggested (Other side, small area) and use some elbow grease with whatever agent you choose. If DB were still here he would have mentioned that BEER is also an essential component of any cleaning/restoration job.
Here is a link to Iron-X to show how easy the majority of the touted solutions are;

http://www.oldgas.com/forum/ubbthreads.php?ubb=showflat&Number=563325&page=1

Last edited by Gasman84470; Sat Dec 27 2014 11:50 AM.