Plastic toilet and sink cleaning?
At some point filling it with water and dishwasher detergent and gentle rubbing with a sponge doesn't work. Resistant stains in sink after mechanical/painting/lubricating work, stains in toilet accum...
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I use a toilet brush and bleach water. I do this just prior to a dump so that bleach is not sitting on the seals anywhere. Then once a year or so we use a toilet bowl cleaner that is for mineral deposits. So far so good and it keeps the seal holding water in the bowl.
