Yes, I used Westleys Bleche-White Whitewall cleaner. It wouldn't touch 'em. The tires had been improperly stored whitewall to blackwall and were filthy. Westleys is about the best product out there no doubt, and I use it frequently, but these things were beyond Westleys.
This might give some indication as to how bad they were. I was cleaning all the 'flat surfaces' before working around the lettering which is where most of the time was spent.
Cleaning in process.
