Cleaning rubbers

Hi coach i have question about cleaning rubbers. In my club no one cleans rubbers they just use some air and brush the rubber with hand is that good? And does water can damage the rubber? 

Hi,

I find that wiping the rubber with a damp sponge is the best way.  You can breathe on your racket and then wipe it as well if you don't have a damp sponge.

If you leave water on the rubber for a while it will discolour your rubber but a damp sponge is fine.