Goopy **** in my tyres!!!!

I know I'm probably being anal (oh no Richard, I hear you say, not you!!!) but has anyone got any suggestions as how to get rid of the dried sealant that collects inside a UST tyre.
I took the "dry" tyres that I used at the Roc off my XC wheels this afternoon and an hour later I was still picking rubber of the inside (and it's still only half done!) ..... I'm too close to dying to waste my time like that!!
Acetone..acetone..petrol..amyl nitrate !! you'll be high as a kite and humping the side of your house !!