after every time I smoke. Whether 1 bowl or 6 bowls, I cleaning it thoroughly with the brush and elbow grease.
Every month or so, I get some stainless steel polish, and fancy up the exterior of my rigs. I also give them a "citrus bath" every month. This bath consists of Lemon, water, a tad bit of vinegar, orange extract, and some peroxide. Works well for me. Call me crazy