I will, I think, give it a whirl, then, sometime in a month or so. Maybe putting it through a rinse cycle in the dishwasher would do the trick - I can then let the dishwasher take the discharge, should there be any.

A further oddity has just resolved itself. The plastics of the machine tell me it's a Macintosh II; the label on the bottom (same piece of plastic) tells me it's a IIfx. I just took a peek at the Service Manual, which in the "Ugrades" pages tells me that there was a IIfx logic board upgrade from Apple that included a new label for the bottom of the machine. Evidently the upgrade was done a long time ago.