Robert11 wrote:
Hi,

I have a shower stall that over the years has apparently had some grout
cracks fixed with RTV/Silicone.

As to be expected, I guess, there is some mold on the Silicone.

Seems to be Not on surface, but probably very slightly below the Silicone
surface. I would guess not too deep, but hard to tell.

Have tried all the normal cleaners, and Chlorox; none seem
to penetrate (at all).

Any suggestions as what to try next ?

The Silicone is probably somewhat porous on the surface, and going down
the very small amount where the mold is, so I can't help feeling that
there might be something that would get down there. Is there ?

Really don't want to have to remove the Silicone, if I can avoid it.

Thanks,
Bob

I tried the hard approach. Does not work. Your going to have to redo it
with mold resistant rtv.

Greg