Quoted from Vector:Buy new ones.
However, since you asked, I buff them using a bench grinder with a cloth buffing wheel. I took a scrap of 2X4 and drilled a 1 1/4" diameter hole with a spade bit to about half the depth of a ball. Drop the ball in the hole and hold the wood up to the buffer. The wheel spins the ball and polishes it in a few seconds. If there are deep scratches, this method will not help.
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