On Thu, 28 Feb 2013 17:07:43 +0000 nestork wrote:

It WILL dissolve cement based tile grout, but only very slowly at a 14%
concentration like you find in toilet bowl cleaners, and almost not at
all in the 6% concentration you find it in in bathroom cleaners.

I have hard water (white calcium carbonate) at something like 15ppm or so.

Do you think the naval jelly will work on that on the shower glass
without etching?