I went to Mayo last year (immune system issues) and told the internist I had chronic gurgling in my ear. He said it was probably related to the immune deficiency and the best thing to keep the ears cleaned out are regular nasal rinses. He also recommended the NeilMedi squeeze bottle.

Now I do it every day with distilled water. Mix it in the bottle with the packets, nuke for 25 seconds, do the rinse each side, gargle with any leftover water, clean the bottle and nozzle with dish soap. Takes only a couple of minutes.

If I'm going to be out like at a store or someone's house, I wait until I get back home to do the rinse, figuring that if I've picked up any Covid cooties, this is a good way to get them cleared out of my nose before they start multiplying too much.