need opinions on best motor cleaners
 

My son wants to sell his suzuki ltz250.
He has cleaned it up pretty well but it still has a light brown haze on the motor
I believe it is from the clay that they use to fill in the ruts where we ride.
So what i am looking for is ideas and opinions on a good cleaner.
I would appreciate any help.thanks

solder seal "gunk" foamy engine brite.

awesome stuff.

Clr