MarzBock
Well-Known Member
That "frost" is probably due to some hard-water stains of some kind. It's INorganic, salts and what-not. Like lime-stains in the bathtub, they are hard to get rid of.
Try a strong acid or base bath. that should do it. Sodium Hydroxide is sold as "drain opener". we clean glassware in the lab with Potassium Hydroxide/isopropanol (rubbing alchohol). If THAT doesn't get it clean, it AIN'T coming clean... well, maybe chromate cleaner would be stronger, but you probably can't get your hands on that (VERY toxic stuff).
Oh, yeah, and that CLR cleaner is probably geared toward this kind of stain as well..
Try a strong acid or base bath. that should do it. Sodium Hydroxide is sold as "drain opener". we clean glassware in the lab with Potassium Hydroxide/isopropanol (rubbing alchohol). If THAT doesn't get it clean, it AIN'T coming clean... well, maybe chromate cleaner would be stronger, but you probably can't get your hands on that (VERY toxic stuff).
Oh, yeah, and that CLR cleaner is probably geared toward this kind of stain as well..