Dirty place on my rubber

Hi

I am training the Backhand Topspin, and  during the training I saw a dirty place on my rubber what can i do to remove that dirty place?

Thanks,

Otto (The Netherlands)

Hi Otto,

The best thing to use is a little water.  If the mark doesn't come out with that then leave it because it won't effect the performance of your rubber.

There are black spots that appear on the red rubber where you have your index finger.  These are OL and just a reaction between the rubber and your finger.