and make sure you keep your unused wheels/compounds boxed up or otherwise sealed away from the flying black crud to avoid cross contamination..
Just sounds like your loose wheel is kinda dirty or the part isn't clean between steps. I use a sponge, and a 50:50 mix of Castrol Super Clean and HOT water to clean between steps. Sometimes I'll use alcohol based brake parts cleaner as well.
I always dry parts with a chamois cloth..
Good luck!
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