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Today, I washed my hands at the kitchen sink while making lunch, and was unexpectedly chastised by my partner because she had just started the dishwasher. Apparently, she has recently come across something that has convinced her that running the hot water in your sink means the water that enters your dishwasher will be hotter (checks out), and thus the dishes will be cleaner. I tried searching startpage to see if this is real, but I couldn't make it through even one llm-slop-ticle about it before my eyes rolled back into my head, so here I am asking y'all: chat, is this real? Doesn't my dishwasher have a heating element? Is there any meaningful difference between heating the water with a hot water heater vs a dishwasher, other than I can't use my sink while the dishwasher is filling and I have to pour a bunch of cool water down the drain?

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[-] uin@lemmy.world 13 points 17 hours ago

Its not so much about that, as it is about the fact that they almost always do an initial "clean-off-the-dirtiest-bits" cycle for around 10 minutes which pulls in (mostly) cold water if your line is not purged like the OP describes. And they don't use the heating element for this initial cycle.

After the first 10 minutes they flush out the super dirty water with the dirtiest food bits and sauce and whatnot, fill in brand new water, and then run for the duration of the washing cycle (1hr plus) along with the heating element.

So flushing the cold water out of your kitchen water lines AND adding pre-wash detergent (such as some extra powder right in the door, outside of the main closable detergent compartment) helps a ton with this initial 10ish minute cycle.

[-] Thebeardedsinglemalt@lemmy.world 3 points 10 hours ago

AND adding pre-wash detergent (such as some extra powder right in the door, outside of the main closable detergent compartment) helps a ton with this initial 10ish minute cycle.

Yup, and that's why some dishwashers include PreWash text somewhere on the side of the door. Sometimes it's even on that little flap where you put the pod

this post was submitted on 12 Sep 2026
130 points (99.2% liked)

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