I'm not sure if this is the right forum to ask this question. If not could you point me in the right direction?
How do we get rid of orange mold under the toilet?
We've tried scraping it off with a knife and putting bleach where we can, but it still comes back weekly.
There are also calcium deposits in some of the grooves in the tile surrounding our toilet.
UPDATE: The "mold" in the picture ended up being that the plumber installed wood shims when our house was built only about 1.5 years ago. The wood shims were removed.
SECOND UPDATE: The builder came back again because it really was mild (happened again with plastic shims). A piece on the toilet (not sure of its name) was defective–the part of the toilet that connects to the flange. Builder said they had never seen this before.
Best Answer
By scraping away the mold you are only treating the symptom, not addressing the cause.
The mold is being fed by leakage from the toilet or drain. The odds are more than 99% it is coming from a leaking waste connection.
To fix it, remove the toilet, clean it up and reinstall.
The directions for removal and re-installing are here. You'll need a $6 wax ring and a couple hours depending on the condition of the fastening bolts, how handy you are, and luck.