Do you have a practical answer to this Home Ec problem? Or it may be a matter of chemistry.

Well if you want to go the natural route try white vinegar first, warm it up and let it soak try around 15 min and then scrub with fine lightly abrasive cloth. Nothing on the sos scale but with enough texture to create a little friction.

If that doesn’t work baking soda paste might. Water and soda though vinegar and soda have a reaction that seems effective too. Apply and scrub.

Another option is to mix baking soda course salt for friction and at 3 to 1 ratio some lemon juice a tsp or so glycerin, found in pharmacy department at walmart and enough hydrogen peroxide to make it goop. Apply and scrub with a cloth.

The longer and more prominent the stains are the harder they are to remove. To prevent future buildup just wash in vinegar upon first notice of them.

Do you live in an area of hard water? It might be worth investing in a water filter/softener.

This sounds like hard water. Are ther brown streaks in the inside of your dishwasher?

Try this experiment:
Load the dishwasher with the ‘clean’ glasses. Don’t put any soap in (Yet)
Start the washer and let it fill
Just when it starts to run. open the door and pour in about 16 ounces, 500 ml of white vinegar and close the door.
Let it run for about 15 seconds so it mixes and coats the glasses.
Open the door slightly so the dishwasher stops. Let it stand for about 2 minutes so.the vineagar has time to work.
Close the close the door for about 15 seconds to let it swish around again
Open the door slightly and let it stand for about 2 minutes so the vinegar has time to work.
Repeat the 2 previous steps about 6 times or until the pre wash rinse cycle ends and the dishwasher begins the wash cycle.
When it starts to fill for the wash cycle, put in half the normal amount of soap and let it run normally.
If you have hard water you might have to do this occasionally.

I have hard water, and agree with the advice you’ve been given. Vinegar and hot water works pretty well to clean both the glasses and the dishwasher. That last bit is important! Our water ruined a brand new dishwasher in less than a year. We bought a new one and had a water softener installed at the same time.

You could try denture cleaner tablets or alka-setzer tablets, one per glass, filled with water and let sit till the scrubbing bubbles stop. Vinegar and baking soda work too.

My water supply is so pure that our school science lab, which does experiments that require distilled water, just uses tap water. So that’s not the culprit.
So far I filled two of the glasses with white vinegar, filling the second with the first one’s vinegar and the third with the second’s. In other words, I reused the vinegar. The three glasses seem to have cleared. I’ll see what happens next. Thanks for all your wise suggestions.

@Sunny2 Great experiment. I think you’ve got it. My approach is more aggressive since it uses hot water sprayed from the dishwasher and covers all sides of the glass.
Enjoy! Invite us all over to your place for cocktails when they’re done.

@LuckyGuy Thanks. It’ll be a small party. I only have 5 glasses. But they are CLEAR!

@Sunny2 Glad to hear it. You brightened my day.