I am about to pull my hair out! I have a hot water unit throwing 5000psi @ 5gal/min. I screwed up and bought a 24" surface cleaner from XXXXXXXXXXXXXXXXXXXX cleaning systems of Ft. Worth, with no service after the sell. AT ALL. The problems that I am having may be simple but I can not figure them out. This is a dual spray bar model. I am currently running 15025 nozzles but I have tried 15030 and 25040. The cleaner is leaving a one inch stripes on both outside edges and it is doing it no matter how slow I walk. Which brings me to my next question. I am having to almost crawl with this machine to get a half way acceptable results. I wash around 100,000 square feet of concrete a week and this slow pace has prohibited my company from taking on new accounts without building new trailers. I have read other posts and tried all fixes that were suggested. If nobody has an answer please point me in the right direction to buy a GOOD unit with some customer support. Thanks to anyone who can help.