Almost any mildewicide will do the trick. Grout sealants all seem to work but I would go specifically to a tile shop to see what they recommend. I think most sealers will work but application and pr ... read more
Abe nailed the answer for you.
If the windows are due for replacement, look for a window with offset glazing or an option of laminated glass inside the standard set of windows.
Dedicated STC windows w ... read more