my macbook pro trackpad are so sticky?

Just lay off of the Hershey bars, for crying out loud!

Try cleaning it. Also if your find your hand/fingers are sweaty while using it, don't rest them on your trackpad. Keep them raised slightly to prevent trapping your body's natural moisture. I clean my whole computer at least once a week.

If you take the battery out, you can part of the trackpad from there. Try inserting some strips of paper (folded in half) in it and scooping whatever dust/dirt/etc might be under there.