Some of you may have had difficulty getting the silver engine cases to look nice after a while, I know I did. I decided to try some Zep Degreaser and a green scotchbiite pad and it looks great, as good as new. Just thought I'd share.

 

i've used the bathroom cleaner, Kaboom. spray on blue, turns white and you see the diirt lift up, also use the scotchbrite pad. works good on the wheels too.

 

Scrubbing Bubbles is what I've used for 12 yrs. now (Dow Bathroom Cleaner).

 

Simple Green or Kaboom, a brush and elbow grease....

 

Ive had good luck with Awesome Orange & a brush. It also makes quick work out of removing diesel soot from the back of my truck

 

Used Simple Green many times with little in the way of results. I use it to wash everything else though.

 

I use Adam's premium car care all purpose cleaner on my bike and my truck, works great on any surface.

But the real kicker is Their in and out spray! spray it on your clean case and it stays clean. I have a black case on my bike and ride short stints of gravel when I go to work and my case stays MUCH cleaner and is much easier to clean once it really gets nasty. my black wheels, swing arm, and frame will have piles of white gravel dust on them, but my engine, primary, and tranny case still look like they just rolled off the show room floor.