More interesting information. I found both the 1952 and 1959 Consumer Reports Dishwasher ratings. I believe CU only rated dishwashers twice during the entire decade, but I could be wrong.
Here are their 1952 findings, in order…
Hotpoint (Impeller) – Dishwashing ability best of all machines tested.
KitchenAid (Spray Arm) - Dishwashing ability excellent
Westinghouse (Impeller) - Dishwashing ability excellent
James (Impeller in a tube)- Dishwashing ability good
General Electric (Impeller) - Dishwashing ability good
Kenmore (Impeller) - Dishwashing ability good
Apex (Impeller) - Dishwashing ability poor
Youngstown (Spray Tube) - Dishwashing ability poor
I have personally had the Hotpoint and KitchenAid 12 hooked up simultaneously in my kitchen, I found the Hotpoint to be the best cleaning impeller dishwasher I ever had, but I still felt that the KA was slightly better. Interesting that their results were reversed. I'm curious as to why, maybe it has something to do with greatly improved dishwasher detergent of the 21st century compared to early 50's detergent? Could be the Hotpoint pre-rinse as well.
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1959 ratings were also very interesting. They loved the new Whirlpool spray-arm designed machine so much that they stated:
"CU rarely finds one particular model of a major appliance that performs it’s chief function so much better than the other tested models that it is clearly established as being in a class by itself. Such; however was the case of one basic design of the RCA Whirlpool . About half of the other machines included in CU's project, as well as another type of Whirlpool proved that they could wash dishes reasonably well, but they were clearly no match for the check-rated Whirlpool."
They also stated: "Automatic dishwashers provide scrubbing action by throwing water forcefully against the dishes. Three basic types of mechanisms are used to accomplish this action. Wash-Arm, Spin-Tube and Rotary Impeller. None of these types proved inherently better or worse than the others, though the check-rated models had wash-arms." Another interesting if not questionable observation.
As for our POD today, the Waste King, they said it would have been at the top of the good rated group, except it was penalized for it’s poorly designed detergent dispenser which didn’t always open properly at the correct time.
The Ratings:
Excellent:
Whirlpool FU-70
Good:
Hotpoint DEF-1
KitchenAid KD-12
Wards Fairway
Whirlpool FU-60
Genera Electric SU-70S/SU-80S/SU-60S
Waste King UC-3D
Fair:
Frigidaire
Hotpoint
Admiral
Preway
Youngstown