Have you contacted Davis yet so you can educate us on the "correct" answer?
Yes I have and I don't have good news, no on the Everclear ( Because of impurities and will leave a film ) and no on the Walgreen Ethyl Alcohol because of the Acetone and "Drew" was not forthcoming with anymore info, it was like he did not want to talk to me. The oiinly thing I can think of is to use Everclear followed with Distilled water.
That sounds like Davis support. In the 12 years I have owned my VP2, I have called Davis support maybe 6-7 times and each time it was a different person answering questions. When I ask if xxx still works there (yes, I keep a log when talking to a support person whether from Davis, Microsoft or whomever), the answer has always been "no." Obviously, Davis support has a lot of turnover, except for the manager, Brett Lane, but at least Davis is providing support, so far, for the life of the VP2!
Conversely, I updated the firmware in my Linksys WiFi router last week and afterwards, something wasn't working correctly. I called Linksys and they wanted $40 to address my issue caused by their firmware update, only because my router was 6 months out of the way too short warranty! In summary, some support (the Davis approach) is better than none!