Recently, my G5220 has been having issues where the pickup selector is scratchy when I change selections and the tone and all (master and pickup) volume controls go in and out sometimes losing sound altogether. It's been suggested that I clean the pots with Deoxit but I'm a bit of a newbie and I'm not sure how to do this. Do I have to remove the pots from the body? Where on the pots do I spray the Deoxit? Any advice would be appreciated. Thanks.