Re: Tough spots on vinyl that vinyl "cleaners" don't clean
I haven't had luck beyond standard cleaning products like Simple Green and Tuff Stuff. I have several color bleed type stains on white vinyl that I haven't had much luck with. Suggestions from online that didn't work have been Soft Scrub with Bleach and a 4:1 mix of water and ammonia. I still need to try hydrogen peroxide and nail polish remover, which I've seen suggested as well. Be very careful with the harsh stuff, good vinyl with a stain is better than ruined vinyl that is clean.
Re: Tough spots on vinyl that vinyl "cleaners" don't clean
The sun actually takes out a lot of hard to remove stains. Be careful with the some of the above mentioned products. Just b/c they don't destroy your vinyl during application, they can dry out the vinyl and destroy the threads over time. Magic Erasures are abrasive, and will lightly scratch. I would stick with 303 cleaner, followed by 303 Protectant.