Scrub with a warm, thin solution of vinegar and Joy or Ajax dish soap, using a paper towel, rinse with warm water, and dry with a flour-sack dish towel.
Otherwise, if somebody wants REALLY clean vessels, just throw the used ones into the glass recycling pile, and open a box of brand new ones.
After all, the cost of glassware is minor, compared to the cost of a nice bottle of wine.
Decanter brushes help with build-up inside decanters. But I usually end up resorting to denture tablets. Pop one or two in the decanter with warm water and leave it there for a few minutes, and that usually removes stains and anything that has precipitated and stuck to the glass.
Just make sure to rinse very well, because the tablets tend to be mint flavored.
Chlorine bleach also works for both glasses and decanters, and the chlorine evaporates fairly quickly so, despite what you might think, it doesn’t leave any residual aroma.
In addition to some of the above…… Don’t leave wine or wine residue in the glass over night. Rinse the glass with water and wash them the next morning-by hand or in the dishwasher.
That is the big one for me. I always dry them with paper towels with no scent. Anything towel with a dryer sheet used seems to add some aromatics. It seems harder to find dryer sheets that are not over the top scented.
I tried this and it does work— we’re on well water with a fair about of mineral/scale build up and it required a bit of scrubbing as well. (Chlorine didn’t work for my issues at all.) You can also use a “glass cook top glass cleaner and polish” — works well but it’s much more work than the tablets.