DW is a cleaning freak. It's a hobby of hers, and actually was part of her career at one time. Her TNT is bleach for sure, but also Baking Soda followed with white vinegar. The foam will drift down and touch all the walls of the pipe. The vinegar is acidic and cleans, and the baking soda cleans and scours as well.
For a new run, she likes hot water and bleach, and for maintenance, she likes the foaming power of baking soda and vinegar. Use a trickle of hot water to push the foam down, and once done, lots of hot water to flush.
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