I used to boil mine off the rims, but to be honest with you Acetone works way better because it dissolves all the original glue and leaves you with new wheels again. If you just boil/ steam you dont actually remove the glue from the wheels (it just sends it brittle so you can get the tyre off more easily) and over time you can get a build up.
Acetone is quite easy to buy (I just got 5 gallon recently), but the carriage is expensive due to not being able to go by Royal mail (Its more flammable than petrol).
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