D3721. Step 7.
Clean wheels.
With the aforementioned battery applied to a pair of wheels, a cotton bud soaked in isopropyl alcohol has been applied to the wheel treads and the backs of the wheels. You should be able to see that all of the dried enamel paint has been completely removed from those surfaces that need to be clean for conducting electricity. Isopropyl alcohol will remove all enamel and acrylic paints from these surfaces, so you will need to take care with where you apply it.
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