I also clean lines as the main part of my business, I use bleach on occasion, it does work, but you must rinse very well. Wine glow, have you tried both the acid and base chemicals from MM?, (also requires major rinsing). Also, do you circulate your chemical in the lines, or are you using cleaning pot method. Circulation also cleans using the friction of the chemical circulating through the lines. For everyday cleaning, I use TSP (trisodium phosphate). In PA., lines must be cleaned weekly, so TSP works fairly well to maintain cleanliness. Like anything, it is easier to keep it clean than to make it clean. I use MM chemicals on problem lines or new accounts that I know have not been cleaned properly.
Larry, the main problem I know of using the silica sand(glass beads?), is that no matter how smooth they are, they can leave microscopic scratches inside the lines, thus giving bacteria a place to hold onto and grow.
Tapman
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