My last comment was sarcasm, but don't take this one to be:
You may want to do a search under the tuning/maintenance section for "base cleaners" or "hot scraping." Much has been written about the pros and cons of each method. There are those who use base cleaners and those who don't. When I first started tuning, I used base cleaner, but I now stick with hot scraping with new skis and after having skis ground. The hot scraping seems to pull out dirt that has been ground into the bases from either skiing or grinding. I do as many passes as necessary until the wax scrapes off clean.
I have never heard anyone say that hot scraping could damage bases (and it shouldn't since bases are supposed to have wax applied) so I follow that method. The base cleaner is a solvent and although I don't know it's exact chemical makeup, I could see how a solvent could be harmful to plastic - polyethylene in this case.
Does base cleaner work as well or better? I don't know.
I suppose what I should do is take a couple of skis that I pulled out of the trash and use base cleaner on one and hotscrape the other. Then I could swap methods and see which removed more dirt. It wouldn't answer the drying out question, but it would allow a comparison of which removed more dirt.
To me, the topic of base cleaning is like talking to your significant other about your previous partners. It may be insightful and interesting at first, but it inevitably turns ugly and rarely has a happy ending.