ill second that...
i always use armor all... works great... armor all also protects metals also... i used it on my drum hardware and cymbals also... i live at the beach so its all about protection... i do you use wd 40 also, but in a pinch.... wd40 also is not the best for long term use... it dissapates pretty quickly and also believe it or not has a slight abrasion quality to it... a good silicone based lube spray would work much better then the wd40... i have even used GLADE furniture polish. works great also. used it on my savage and t-maxx for years...
after i wash my buggy down, i liberally spray it down wit some armor all, let it sit for about 10 minutes, blow it lightly wit only 20-40lbs of pressure from the compressor (i know i know. everyone has a problem wit the compressors, but if you don't run it over 40 psi you are fine... ) then wipe it down wit a rag to spread out armor all and get the extra off... after i am done she looks like a shelf queen... i do this every other outing. so my build up of crap is not that bad... but works like a charm and the armor all protects more then you would think...
IMPORTANT... NEVER USE GLASS CLEANER LIKE WINDEX OR ANY OF ITS KIND TO CLEAN YOUR RIG... not so much a problem wit the body, but you do not want that on your electronics or wires... i don't know really why besides it breaks down the wire, or connections, or solder... but every elder man in my family is a mechanic and they all say the same thing. so i just follow that rule of thumb and never ever had a problem...