Recieved a bag of this with my new karcher power washer. The actual product does a good job and the car definitely looked good afterwards. However I have two issues with it. The machine drank the fluid like water and I'd only get 2 car washes out of the whole 5l container (no way of controlling the amount of fluid the machine draws in). However the main issue I had was with the bag itself. A nice idea in that it's cheaper to post since it's so concentrated and you water it down. BUT somehow the bag developed a small puncture, so when I went back 5 days later, most of the fluid had escaped. IF I buy another one, I'd transfer it into a solid 5l container (as used for screen wash) and it should prevent punctures!