No, no, no.
Don't ever take your remotes apart and remove the black layer between the rubber buttons and the circuit board.
That "black stuff" is not dirt, it is the graphite required to make electrical contact. Remove it all, and your remote won't ever work.
Try some of this:
http://www.amazon.com/CaiKote-Kit-sw...pad+repair+kit
I've never had to redo the contacts a second time after using this product.
.