I'm a little worried about usind sand to clean the frame....seems that even if you have a respirator, that's not good enough. I'm wondering if anyone knows about how long it will take to clean the frame. Glass beads are about 25 dollars for 50lbs. versus $3.55 for a bag of sand. I don't want to seem cheap but I don't want to end up paying for it with my health later.... anyone got any ideas