> self-evidently abrasive, which stands to reason when you look at the scratch marks in glass that has been through too many cycles. Marks on glass are not due

> self-evidently abrasive, which stands to reason when you look at the scratch marks in glass that has been through too many cycles. Marks on glass are not due to abrasion, they appear because glass is slightly soluble in alkaline water, which is the case in dishwashers. Porcelain and stainless steel do not get scratched by dishwashers for example.