I'm getting a lot of information about using deoxit to clean my switches and controls for my HK 730. I bought it in 1976 and it still looks and sounds great. There is some scratchiness in some of the knob and switches. Which deoxit do I use? I have never cleaned any electronics before, but I want to play my 730 with my Jbl L100s and my Ar XA manual turntable.