I agree, I also utilize their rinseless product as something that I can find over the counter for a decent price that I can use for clay dilution, spray detailer, or actual wash dilution. Now, they do recommend a 2oz per gallon wash dilution that I haven't been able to test yet compared to Optimum's blue formula rinseless wash solution, but it's something that I'm looking forward to testing. Since I'm using mostly 2.5 gallons of water per car I use, I am using at least 4oz of TW's product per wash, but I haven't noticed any wash induced marring added to the vehicle, and I'm actually wondering if TW purchased Optimum's first rinseless solution to their lineup or came up with something "slightly" original. It smells very similar to Optimum's first solution that I had experience with and I have to admit that I found no problem with that product at all.