B STAR, thanks for your help.
It makes no difference, whether we use it or not, the moisture is still there in the grout.…

Forgot to add, yes there is a shower in this bathroom, but it's at the opposite end of the room to the toilet.

I hope this works.

Hi,
I am wondering if someone here has had the same issue we're having with our toilet. 2 different plumbers have looked at it and neither of them seem to…