Verdict: False. Whirlpool tells owners not to substitute vinegar for rinse aid, because its high acidity can damage the dishwasher's hoses, gaskets and other internal components.
Where the idea comes from
Rinse aid and vinegar seem to do similar jobs. Both are associated with spotless glasses, and vinegar is famous for dissolving hard-water film. Pouring a little into the rinse aid dispenser looks like a natural, pantry-shelf version of the same thing, and the tip shows up in plenty of cleaning lists.
In a hard-water region like much of Los Angeles County, where cloudy glasses are common, the swap is especially tempting.
What the evidence says
Whirlpool's guide to using rinse aid in a dishwasher is direct: "Avoid using vinegar, as its high acidity can damage your dishwasher's hoses, gaskets and other internal components." It also advises against substituting other things, such as vinegar, for rinse aid.
The same page explains what rinse aid actually is: a drying agent, released during the final rinse, that helps prevent streaks, water spots, white residue and hard-water buildup. It's not a detergent. A full dispenser holds about 5 ounces and should last about a month. Whirlpool's advice for hard water is "Don't skip the rinse aid," and for drying problems it suggests turning the rinse aid setting to the highest level.
Whirlpool does describe one controlled use of vinegar. Its page on cleaning the dishwasher interior says to place, not pour, 2 cups of white vinegar in a dishwasher-safe cup on the bottom rack and run a full cycle with no detergent. It adds the warning that matters here: "vinegar is an acid and using it too often could damage your dishwasher." A dispenser full of vinegar releases it into every single load, which is the opposite of occasional.
What to do instead
- Fill the dispenser with a rinse aid made for dishwashers, to the fill line.
- If dishes come out wet or spotted, raise the rinse aid setting one step at a time.
- Check the dispenser monthly; a colored rinse aid makes the level easy to see.
- For buildup inside the tub, use a dishwasher cleaner on the schedule the manual gives. Whirlpool recommends affresh Dishwasher Cleaner monthly.
- If you want to use vinegar at all, follow Whirlpool's cup-on-the-rack method, and keep it occasional.
Exceptions worth knowing
- •Very hard water may need more than rinse aid. The same Whirlpool interior-cleaning page strongly recommends a water softener at 15 grains per gallon or more.
- •Your manual outranks general advice. If your dishwasher's use and care guide allows a product, follow it.
- •Etched glass won't respond to anything. Cloudiness that stays after a soak in vinegar is etching, which is permanent.
- •Wet plastics are normal on many models, even with rinse aid, because plastic holds less heat than glass or ceramic.
If dishes are still dirty rather than just spotty, check whether your dishwasher filter needs cleaning.
Sources
- •Whirlpool: How to use rinse aid in a dishwasher (vinegar warning; what rinse aid does; hard water; settings)
- •Whirlpool: Cleaning the Interior, Dishwasher (occasional vinegar method; monthly affresh; softener at 15 grains)
The short version: Rinse aid goes in the rinse aid dispenser; vinegar, if used at all, goes in a cup on the bottom rack once in a while.
Spots, film or wet dishes that hang on with rinse aid in place deserve a technician's look. Book dishwasher repair with TrueFix Los Angeles or call (213) 787-3989.