More great advice. Thanks!
I have found a trick to unclog them, thanks to the internet. Remove nozzle, and hit it from the inside with canned air. I've also seen WD-40 used. That should force any dried/stuck particulates out of the nozzle. I also have a pack of "art" nozzles from another project I can swap in and out if necessary.
I just discovered that you can get new replacement nozzles, quite inexpensive. 60 of various sorts for $12:
https://rover.ebay.com/rover/1/711-...0001&campid=5338413729&icep_item=221344648133
Best -- Terry