It's entirely possible that a cold pre-wash helps avoid staining! But that's not what I'm complaining about.
TC made specific claims about the benefits of a hot pre-wash. Instead of countering those, the blog's author decided to ignore them and build his own strawman to attack.
The author should have refuted the specific claims, or acknowledged them before moving to the drawbacks.
blog author actually discussed it. in form of explaining that hot prewash stains, 85% of cleaning done mechanically, the rest is done with detergent with temperature been supportive (according to published "scientific literature") and that who cares about how things are clean after prewash as long as dishes come out clean after main wash.
in general, it's hilarious. there are literally dozens R&D departments that design dishwashers across dozens of companies. And all of them are wrong because somebody run tests on (checking notes) 30 years old dishwasher.
i trashed dishwasher similar to the one that tests are run on 4 years ago. it was washing everything just fine with exception of few days when check valve broke. after i replaced it, it came back to washing perfectly with cascade platinum pods
This is why you pre-run the hot water in the tap (assuming the dishwasher is attached to the hot water tap/pipe), so the dishwasher has hot water for the pre-wash already. Works for us for a better overall cleaning.
Then why don't manufacturers recommend this? Why don't dishwashers in Europe (which have access to higher voltages) run the prewash hotter?
It's because, as outlined in the linked article, hot water makes the problem of staining plastic worse. So they try to mechanically remove it before the main wash. Note that in the original video, the main wash heat temperature wasn't impacted by preheating the prewash.
Rather than jumping into this whole thing in the middle, I'll ask you to begin from the beginning, catch up on what you missed on (the two earlier Technology Connections that were made before the submission article), so we can at least have the same base-level understanding of the situation first, then you can come back and we can argue the entire day.
I have a high end euro-style Bosch, largely seen as one of the best washers out there. No indication in the manual of running hot water. In fact the manual shows the temperatures that all the different cycles run at, and the "pre-rinse" cycle does not show a temperature. The manual also doesn't say to add any detergent other than the main cycle and recommends pacs. Its always at the top of industry testing, so I am thinking a random YouTuber might not be correct here.
They literally don't. it's not in my manual and not in manual cheapest LG and GE machines that are currently available for sale
This screenshot is seems to be from manual of Frigidaire FDB520RHB or something similar that was discontinued 12 years ago or so.
Some of the programs of this dishwasher will heat water as needed, and in addition there is a button "hot wash".
showing manual of 20 years old machine today as proof for how machine should be operated it's just like arguing with todays doctor using 300 years old medical books.
i don't pre-run hot water in the tap. my dishwasher meant to run pre-wash with "whatever" water (and is quoted in article, having hot water in prewash can actually stain things) and it washes everything perfectly. in fact all dishwashers i ever had washed everything fine (as long as they didn't have physical malfunction).
if dishwasher manufacturer thought that prewash needs hot water, it would have heated it to appropriate temperature like it does when it needs to.
TC made specific claims about the benefits of a hot pre-wash. Instead of countering those, the blog's author decided to ignore them and build his own strawman to attack.
The author should have refuted the specific claims, or acknowledged them before moving to the drawbacks.