[Arran]

You don't need steel wool at all to use the GoJo, just a rag or a paper towel will do. It isn't really something that you need to worry about cleaning off, I think if you wait a while any ingredients left will evaporate.
As for the decals you can strip around then to save them if careful, then mask over them if you need to tone spray. I believe that Radio Daze does have reproduction Transitone decals but check first.
Regards
Arran