HP-30B screen protector secrets?

[Eric Rechlin]

I've always been able to peel them up with my fingernail. A little residue is usually left, especially on the corner where I pull it up from, and isopropyl alcohol cleans that up just fine.

Warning: some 30b calculators were from a different production run where the blue ink on the keys is alcohol-soluble and will be completely erased with alcohol, so be careful. Other 30b calculators are completely unaffected.