What are the effects of pendulum serve?

HY! I can do a very good serve and most of my friends cannot return due to a lot of side spin.

Only a few weeks have passed, now i cannot add the spin i want to add on the ball. I bought my new racket a few months back. Is it happening due the pendulum serve or i have to clean it properly.

Hi Maaz,

Try just wiping the bat with a damp sponge.  This is all you need to do to clean the rubber.  If it still isn't gripping the ball then the rubber is probably dead and needs replacing.  A rubber can die due to a lot of hitting or spinning like the serves but it is usually just a general wear from use or keeping out in the heat or dust.