A 1929 dishwasher.
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Connect that to a small generator, and you could power a light bulb and not have to do dishes in the dark! 
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Or, do dishes during the day when there is sunlight! Or use moonlight/starlight at night. Or use candlelight, or a gas lamp. You’ll still be in the dark though regardless of any of those things if you’re blind.
Dishes should be rinsed in clean water
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