I have used 7 (seven in words) different car wash liquids with a pressure washer and foam cannon (with Bosch EasyAquatak 120 which has a very mediocre foam cannon). None of them produced satisfactory foam (like in the photos that present them) and they did not clean without the use of a sponge. The Karcher RM81 was recommended to me by a friend with enthusiastic comments. I use it at a ratio of 15% (3 tablespoons in 300 ml of water in the foam cannon which is enough for a medium SUV) and yes, it hardly produces any foam but cleans perfectly. I rinse the bodywork well first with the pressure washer and plain water and then wash it with the foam cannon. I let it act for only three minutes before rinsing it very well with the pressure washer. Do not let it act longer because it is strongly alkaline and leaves spots. Then I wipe it with microfiber cloths. Perfect result without a sponge for a city car and its usual dirt. I have not used it for off-road situations. It is also the most economical liquid I have used. I highly recommend it