I scratched the dead wax on a DG just by setting downforce too high on the vacuum arm on my Loricraft. (BTW, "too high" means "per Loricraft's instructions".)
I don't know if other record labels would be as easily damaged, and I don't want to find out! I reduced the downforce as soon as I saw the damage.
As far as cleaning goes, while I do use DD brushes for two of the solutions in my regimen I'm not convinced that scrubbing very hard is beneficial. I'm more in Hdm's camp. If I need more energetic fluid motion I'd try steaming or maybe ultrasonic rather than physical abrasion.
I don't know if other record labels would be as easily damaged, and I don't want to find out! I reduced the downforce as soon as I saw the damage.
As far as cleaning goes, while I do use DD brushes for two of the solutions in my regimen I'm not convinced that scrubbing very hard is beneficial. I'm more in Hdm's camp. If I need more energetic fluid motion I'd try steaming or maybe ultrasonic rather than physical abrasion.