It's hard to tell what it is, but...my suggestions:
1. blow dryer to heat it, towel around thumb to rub it off 2. Goo-gone 3. Meguiar's Cleaner Wax
If none of those work and the rubbing compound didn't work....
- Pete - 00 SVT SF/MB - 1522/2150 - DOB 1/12/00 ------------------------------ 92% says your group-NOT HOT 85% says your either wrong or BLIND Blackhawk Down did NOT suck you know who you are.....