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Summary: Make sure grout is dry before cleaning grout off glass mosaic projects. Learn how to clean grout off stained glass mosaics such as mosaic picture frames in this free video.
Rachel Kadner is a mosaic artist based in San Francisco who has been creating mosaics for over 7 years. She specializes in making mosaics for the home, including mirrors and fine art...read more
"So, you're going to wait, and it takes about five or ten minutes until you see a dry haze of grout on top of all of the glass. You can see that it's dried; it'll just flake away like that. But, make sure that it's dry before you start cleaning it. What you'll do is you'll take a cellulose sponge, that's these big yellow ones and you'll get it wet with clean water, but please wring out the water. And, you'll use that to lightly brush the grout off of the surface of the glass. Don't worry about getting it perfectly clean because you'll have to clean it again in the next step. But, just clean it enough so you can see the surface of the glass. And, you're already starting to see what your finished mosaic is going to look like. At this point you'll need to let it set again for a few more minutes, until you see that same haze. Some people do two wet washes during the grouting process, some people only do one. Today we're just going to do one."
eHow Article: Cleaning Grout Off Glass Mosaics