Small correction, the Wayback Machine does not actually store the MIDI file playing or the hit counter running. What it saved is the HTML and images from a crawl, and your browser is the thing that makes the page feel alive again. The MIDI might be there as a file if the crawler grabbed it, but a lot of times it is missing and the page just loads silent. Same with hit counters, those were often run by a script on someone else's server, so the number you see is frozen at whatever got saved or it is broken entirely. Not trying to rain on your find, that vending machine page sounds great and I am glad it survived. Just wanted to clear that up so you know why some old pages come back missing pieces even when the Wayback Machine has them.

Learned that lesson too, butt set saves hours every time.

What was your dwell time like before you started rinsing? Even in that heat you might get away with doing one panel at a time and not letting it sit at all. Curious if you tried shading the car or working early morning before ditching it.