Often the brown stain has iron in it. Get an iron remover like "Iron Out". Red iron is oxidized. Bleach is also an oxidizer. It will not work.
Add Iron Out and a smidgen of water.
Agitate with brush or soft abrasive like Magic Eraser or a sponge with soft abrasive side.
Flush
Dry the ball and add Lime away.
Agitate with soft abrasive.
Repeat until clean.
I do this when tenants move out after three years of not cleaning the shower. Actually I used to use the above method. Now I use commercial cleaning chemicals, rubber gloves, and a chemical face mask. In this case, be sure to drain and flush the black tank afterwards.
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Paul Bristol
Kodiak Cub 176RD
Nissan Pathfinder 2015
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