Have a problem and looking for advice. I did a track weekend and got Massive (with a capital M) rubber build up on my track tires that doesn't want to come off.

Details...

- Tires are Falken RT-615s

- This was my third track weekend with them and they were fine for the other two.

- This weekend was at Thunderhill and it was Hot - 95-100 both days. Plus there was an ARC race both days so some full up race cars (incl Vettes and Vipers) on race rubber.

- I heard balls of rubber hitting the underside of the car late Sat. when I went off line to pass/be passed. Saw some buildup end of day Sat. but didn't feel anything.

- Sunday morning was fine, afternoon sessions big vibration that felt like pickup, but it wouldn't go away. Back on street tires, and car is fine, so it was the track tires.

- Now lots of buildup on the tires and it's vulcanized on. Tried using a hardcore window opening tool to scrape off and no luck.

Anyone have this problem and have a good solution for getting it off? Does using a blowtorch work - as seen on the races on TV? Drive around on the streets for a while (doesn't seem safe somehow)? Go do an AX on them?

Give up on a half used set of value priced Falkens (cost of doing business)? Was thinking of bailing on the street set/track set concept anyway. Changing tires twice in three days in 95 degree heat will do that to you. Thinking of going to Falken 452s as a street & track tire. I'm in San Francisco, so no snow, just rain.