Thanks for the kind words!
You raise a good point, as even 70% alcohol can lift stenciled lettering off plastic and metal depending on the original application process. I cleaned up a nice old Mitsubishi receiver (the 1980 series with the retro rotary FM tuning dial) that is now minus its "power" label because even ordinary isopropyl was too strong. So yes, I'd start with Windex on anything with lettering underneath just in case.
I only use the anhydrous for cleaning contacts and the really stubborn grime around the most used controls, such as "volume." Target's house brand includes both 70 and 90%, and the second one is probably strong enough for any need (and costs a fraction of the 99.9% stuff).
The fellow who built my new Thorens dust cover is Alex, the manager at TAP Plastics in downtown Seattle. He mentioned that a lot of the locations have a resident "dust cover guy" who likes and specializes in that sort of thing, so it makes sense to call around the locations and they can refer you. TAP does a lot of hobbyist and commercial work, so the occasional CE project is fun for them. He also showed me that clear acrylic looks a lot better on older gear than smoked plastic.