I also have a Kenwood RC-R7050 remote control with the sticky surface condition. It appears to be migration of the plasticizer from the plastic body, the same condition as my sticky car dashboard. After much trial and error I have found one way to deal with it. First I take the remote apart and work only on the plastic body. The circuit board and insides were not affected. I used a silicone vinyl and rubber polish on the tacky surface to mix with the plasticizer without harming the surface of the plastic. Then I scrubbed the mixture off the surface using Dawn liquid dish detergent. The surface looks and feels as good as new although it may get tacky again in the future as more migration occurs. Thanks for all the great info on IR receiver repair.