How do you clean a dak ix , x channel selector switch, its sealed

[darticus]

HOW DO YOU CLEAN A DAK IX , X CHANNEL SELECTOR SWITCH, ITS SEALED
Any thoughts on how to clean the selector. I have a Dak IX that must be shut off each time you place it on a channel and than turned on again to get the channel to receive. This has to be done every time you change a channel. When on a channel if you slightly turn the channel selector switch its stops receiving until you turn the set off and than on again. Sometimes you have to turn it off and on 2 or 3 times before it starts receiving. I'm thinking this sealed switch is dirty. HOW TO CLEAN? Has anyone done this? Would there be another answer to this. Receives excellently when working and transmits great also! Any thoughts??? Thanks Ron