UPDATE: It's working now. I had left the house for a few hours and then tried the mouse again. My guess is that enough alcohol got into the mouse's innards to dissolve the gunk that was interfering with scrolling but it took a bit of time. As I write this, scrolling seems normal.
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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