Originally Posted By: gary031
If you engine has lots of Aluminum, and you decide to use Simple Green and let it dwell, your in for some surprises. That's one ugly combo. Simple Green HD, better choice.
That is why I use Awesome from the dollar store. Its mild on paint, trim and aluminum.
I have been power washing motors for decades. Never had a problem. Modern motors are sealed well. Sure use common sence and don't power spray the alternator electronics or the fan belts and blades. The fuse box is weather tight(usually).
I spray it on , let it soak on a warm motor and the entire area, let it sit 10 minutes , pressure it off.