What would be the best way to detail a frame and engine on my 96 M900 thats been left to get years of grime build up? I have removed most things that are easy to get off, but I don't want to go so far as to take suspension and engine out...I'll leave that for a winter project. I am concerned about electrical parts getting wet. I also have some yellowish stains from a leaky gas tank that have left a trail. I want to make it look as good as possible without complete disassembly.