Chris,

I sprayed almost a whole bottle of Simple Green on engine and compartment, then immediately washed off with hose. Sparkling clean now, but I'm left with the belt squeeling. I guess I glazed them with the detergent and/or water (?).
Oh well, I'll be changing them in Dec. when I do the head gasket. I'll give the belt dressing a look-see. Thanks!

You want to increase grip, not decrease it. Probably some of that ancient oil crust got onto the belt.
What did you do, by the way? Hand spray on the Simple green, then hose off? How long did you wait? Inquiring minds want to know...