The cleaning frequency of commercial grease traps is determined by city codes as well as the size of the trap. When it’s time to have your trap cleaned a special vacuum truck will come to the site to do the cleaning. The trap is vacuumed out, the the sides are scraped to remove buildup. The the trap is then cleaned with a hydro-jetter, which squirts water into the trap throughly cleaning it. You can see a demonstration in the video.