Home>Discussions>KITCHENS>Dishwasher leaves greasy film
5 posts / 0 new
Last post
chimebowl
Dishwasher leaves greasy film
chimebowl

I have a Kitchenaid dishwasher that is about 5 years old. It worked perfectly until about a year ago, when it began leaving a slight greasy film. Nothing else has changed--the setting on the hot water supply is the same, detergent the same, water is the same, etc.

I have tried different detergents, including liquid, and that doesn't help.

The rinse agent container is full and functioning.

I have cleaned all of the traps and screens.

I have checked all of the holes in the rotating sprayer arms.

I have run a couple of cups of vinegar through it.

This past weekend I removed the dishwasher, flipped it over, and dismantled the entire pump and drain system. All of the lines were free and clear and all of the impellers were intact.

The only thing I can think of now is that the heating element is not working. It does seem as though the dishes aren't drying as well as they did in the past.

Any thoughts?

A. Spruce
Re: Dishwasher leaves greasy film
A. Spruce

I just had to replace our 15 year old GE with a new Kitchen Aid, and had a similar problem with slimy glasses, of course, everything was slimy, you could just see it better on the clear glass. At any rate, after multiple test runs, we found that using less detergent was the key. We went from filling the primary cup and the prewash cup down to 1 tablespoon.

I do not know if it is less powerful jets, less water per cycle, fewer cycles, change in detergent formulation (still using Cascade crystals ), or what. We do not use a rinse aid, other than what is already in the detergent. It is possible that you need to change the quantity of detergent you are using.

ordjen
Re: Dishwasher leaves greasy film
ordjen

This is anecdotal advice, I don't know if it works: I have had customers come in looking for old fashioned TSP washing powder. It seems that in recent years, detergent manufacturers have had to cut back on the phosphates in detergents. Phosphates are getting into the water shed and causing algae grow in lakes and rivers. These customers swear that adding a small amount of TSP (Tri-Sodium PHOSPHATE ) cures the problem pf greasy residue.

Phosphates convert grease to soap. Great Gramma used to make lye soap by mixing and cooking grease with ash from wood fires. Ash is high in phosphates. TSP converts greasy residue on walls to soap. This is why the instructions for TSP tell you to rinse the wall down after washing with TSP. It is not good to paint over soap either!

I don't know how much TSP is being added. It could be harmful to use too much. The TSP istructions warn that too much TSP can etch glass!

ordjen
Re: Dishwasher leaves greasy film
ordjen

This is anecdotal advice, I don't know if it works: I have had customers come in looking for old fashioned TSP washing powder. It seems that in recent years, detergent manufacturers have had to cut back on the phosphates in detergents. Phosphates are getting into the water shed and causing algae grow in lakes and rivers. These customers swear that adding a small amount of TSP (Tri-Sodium PHOSPHATE ) cures the problem of greasy residue.

Phosphates convert grease to soap. Great-Gramma used to make lye soap by mixing and cooking grease with ash from wood fires. Ash is high in phosphates. TSP converts greasy residue on walls to soap. This is why the instructions for TSP tell you to rinse the wall down after washing with TSP. It is not good to paint over soap either!

I don't know how much TSP is being added. It could be harmful to use too much. The TSP istructions warn that too much TSP can etch glass!

Fencepost
Re: Dishwasher leaves greasy film
Fencepost

While TSP (Trisodium Phosphate) may help, the phosphate ingredient previously used in detergent has been sodium triphospate or sodium polyphosphate. From what I understand, it's not quite as harsh on glass as TSP, but still has a good degreasing action. In Washington State, all phosphates have been banned from detergent for a number of years. The reduced effectiveness of phosphate-free detergent is noticeable.

In response to the change in formula, dishwasher manufacturers have increased cycle times.

Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.