I forgot about my Klasse car wash test last weeked. Not good. I put one capful in a bucket of water without soap. Rinsed and washed the car that way(dumb). One bucket for rinse, one for wash. Very disappointing results. After washing the car, I found it left a huge thick film on the car with some dirt left over(luckily I didn't notice many swirls from the dirt I may have been rubbing around while washing it). It rained that night so I did the test again the next day with soap and Klasse. This time there wasn't any dirt left but still a heavy film. The film was removed when I decided to dry the car off with an MF towel. The car looked great and shined nicely once you completely wiped off all of the film with the MF towel. Not a good use for Klasse, but I may have been doing it the wrong way. This is why I decided it was a good time to try Liquid Glass, since I realized this wash probably removed all of my SG and AIO I had on there, and I would have to reapply AIO and SG anyways.