I had just posted this in another thread on this forum in response to the same question. 'Thought I'd re-post it here:
"DR 60 is the product and it is a liquid - applied with an airless sprayer - then pw'd. I tried it about 2 yrs ago on some drive thrus...Bottom line, too expensive and, if a second application is needed, you have to wait until the drive is dry - another trip.
If the drive to be cleaned is not too heavily greased-up, I might use it...if it weren't so expensive. As I recall a 5 gal bucket is about $100 - not including shipping. You will use about 1 gal per lane. Also as I recall, hot water is not needed as long as air temps are above 70."
(Hi Lenny!)