Hello, I wonder if anyone knows if cleaning crystals in glass cleaners (like formula 710) cause any scratches on the inside of glass tubes, etc? I'm think I've noticed my glass has scratches after using cleaners with crystals. I should take a before and after picture sometime to see if it's true. I've been told the crystals are salt but not sure if that's true either. These cleaners are fast and effective but I may switch to blends without the crystals. What do BM users like to use? Any idea if my hypothesis about scratches is right?