Servus, before the winter I had seen someone in my city in the SB-Box who applied the detergent by means of a pressure bottle. The paint was then really buried under a thicker, viscous foam layer. After a short exposure time everything was scratched off and the result was also seen. What impressed me about the method was the fact that everything was going very fast. After about 5 minutes (excl. rims) the outside was through. r, that this is not comparable with a hand wash. For a fast laundry, especially at current temperatures it seems to me to be a suitable alternative method. Does someone of you also grasp the pressure bottle and if so which shampoo you use? Would all means be suitable for this or are there any ones that glue the spray nozzle? Thanks already in advance