I tried your suggestion using rubbing alcohol instead of water and it didn't work. I will phone Apple (I still have Applecare) for alternative ideas and also to see if Apple will replace the mouse under warranty. If they suggest that I take it to a Genius bar, I'll try that. Worst case: I'll buy another mouse.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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