Well remember this, the ball is dull, you will get more oil soaking in the cover and the cover is made to suck oil in, its much like the covers on the one series balls from ebonite (company that makes hammer) so the ball will track up. You might want to lightly hit the surface with an abrasive to get the grit back to OOB and every 50 games or so give it a hot water bath to remove water.
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Just another aspiring junior bowler who hasn't hit full stride yet.