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A while back I started noticing a moldy smell in our bathroom. I'm mostly deaf but my nose is very sensitive. I traced it to the shower. I tried cleaning all that black and green stuff off the walls, but the smell persisted. DW poured some bleach down the drain and it went away for a while. I'm worried about killing our septic tank with bleach. Any ideas on something else that may get rid of the smell without harming the septic system?