"Chet" wrote:

Can Simple Green Concentrate be used with a pressure washer?
Web search wasn't much help...
If so, should it be diluted?

How about if you spray the item to be cleaned with a low pressure
sprayer or even a mop/sponge, let it sit and then hit it with the
pressure washer.

Are you using a venturi pickup or is it coming out of a portable tank?

How important is it if a soap/detergent residue remains?

Even though they claim non-toxic, if you were to use Simple Green (or
any strong cleaner) in a way that generates a lot of mist/fine spray,
some will get into your lungs and could significantly affect the
surface chemistry. Probably not a big deal if it is way diluted but
eyes and lungs could be severely irritated if used in concentrated
form even ~ 1:10 diluted.

I'll also make a closing plug for the less famous Costco line of
cleaners - detergents and degreaser.