1970 (?) Schwinn Varsity. Decals - white/cream on blue paint - are nearly intact, but pretty dirty. What can I use to clean them that won't damage them?
The one on the seat tube looks almost like a paper label, but feels like a decal. The script on the down tube I cleaned the end where there is some some paint damage with Simple Green and it seemed to clean up pretty well. But I don't want to use anything that will cause long-term deterioration.
Goo Gone with a non-abraisive cloth or sponge has worked reasonably well for me. I imagine Simple Green could work well without damaging the decal if you don't let it soak for too long. I'm not sure if repeated use over time would contribute to making the decal more brittle, but it is something to think about. Perhaps someone else has more definitive information.