So, I've made a 'rookie junker' mistake, I'm hoping someone can help me with. I was working on my POSSE project - don't want to give out my details, yet :) - anyway, I grouted my glass and had to go do things with the young. Anyway, it set over night and so that grout is really set up. What is the best way to clear it off my glass? My BF is wanting to power wash it, but that makes me nervous. I was reading about using acid on it, but that also makes me leery. Help, Help, help, please :)