Got the chance to wash the cars today. I used MDR 2oz per gallon with 1oz ONR in a sprayer and soaked them down. Let dwell for 5-7 min. Power washed off then did the 256:1 ONR RW method with the new Ultra black sponge from TRC Both cars are coated, the Saturn has about a 4 year old CQUK 2.0 on it and the GP has almost 2 year old Gtechniq CSL on it. I usually just do an ONR presoak at 256:1 and that works well, the MDR seemed to start melting the salt before even rinsing. I didnt see the same actions using just ONR.