I distinctly remember hearing or reading about Proctor Gamble finally having to disclose their secret formula for Magic Eraser, due to a lot of people having reactions, and hearing it was lye. Maybe it was just one of those rumor that gets out there.http://www.snopes.com/medical/toxins/eraser.asp
This relieves stress and explains why it has had no ill effects on my fishes. No lye but formaldehyde, but it's bound to a physical form, not water soluble. If day old Ray pups can handle it, must not be too toxic.
Divemaster. I'm sorry I don't have a solution. Have you tried scraping with a razor?
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OP, maybe try vinegar for your glass and/or Magic Eraser since its safely been working for Dieselhybrid