I have a grouted glass block shower enclosure. Over the years the grout has wicked in moisture, causing mildew to form in the interior grout seams (between the grout and glass). I tried spraying the exterior grout (in copious amounts) in hopes it would suck in the mildew remover and get rid of the mildew, but it hasn't. I am now about to remove the grout in the effected areas, hopefully clean out the mildew, and regrout the seams. Is there any other way to approach this?