I was going to ask the same exact question about the Ultima product, but comparing it to Opti Clean as a waterless wash. The other day I sat down with a calculator and figured out how much a bunch of waterless washes cost by the ounce in there final mixed form. I forget the exact numbers, but I think Opti Clean was around 8 cents an ounce and the Ultima product diluted as a waterless was by far the cheapest at around 2 or 3 cents an ounce. Griots was insanely expensive, as it comes premixed at something like 25 cents an ounce. It's great to know the lower cost products, Ultima and Opti, are probably the best. I still can't believe it only takes half an ounce of Ultima to mix 22 ounces of waterless wash. As a waterless, what's better performing? Opti Clean or Ultima?