I just have a bucket of acetone in the shed, soak em in there for a day or two with something over the bucket to stop it evaporating.
Rubber gloves, remove tyres, squeeze out foams, leave outside to dry off, done.
Can re-use the acetone many times.
WARNING: Don't try the oven method after you've tried the acetone method... that sets fire to your kitchen... Matt-H will tell you...
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