Detergent packs are kinda wishy-washy (Dishwashers Explained)

Technology Connections15 HN recommenders · 2021–2025
6M views · explainer · evergreen · Uploaded 2020-12-20

Technology Connections explains how dishwashers work, why detergent pods underperform powder, and how to use the pre-wash and main-wash compartments. It argues you don't need to pre-rinse dishes.

HN repeatedly recommends it as the definitive, mind-changing explanation of dishwasher use, even though it runs over 30 minutes.

Watch on YouTube

20 comments from Hacker News

@throw0101a2021 · in “SSD makers start warning that mining products like ChiaCoin will void warranty”

Technology Connections has got you covered: > Ever wonder how dishwashers work? Are you ever bummed by the performance of yours? Well, this video can answer your question and possibly provide you with a solution! * [VIDEO]

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@sp3322021 · in “Ask HN: Are Dishwashing Machines Bullshit?”

You don't have to pre-clean dishes. This video is a bit long-winded but gets the point across. [VIDEO] One person doing one person's worth of dishes is pretty manageable. Once you get more people involved, or if you're getting a lot of utensils dirty while making something fancy, it can be a whole different story. Also, I think they use less water than washing by hand, but again this depends on how many dishes you put in there at a time.

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@spijdar2021 · in “Slow Electricity: The Return of DC Power? (2016)”

I haven't watched this video in a while so apologies if it's not specifically elaborated on, but I believe it's covered here: [VIDEO] From memory yes, it's partially about water usage, but dishwashers are in general just pretty good overall about efficiently using energy to maximize "food grime removed" per unit of resources fed in. Even if you're careful with water usage while hand washing, I think a decent dishwasher will beat you. Another advantage is the dishwasher heats its own water, whereas with hand washing either you need to use a house-wide water heater or preheat water in a kettle or something, which will have its own energy wastes. This of course depends also on how your house's water is heated. One page I found googling elaborates on these ideas, concluding that you could potentially be more efficient hand washing, but only with a lot of effort: [LINK]

@balefrost2021 · in “How to properly load a dishwasher (2020)”

Somewhat related: if you want to watch a 32 minute video about how to properly use a dishwasher, here you go: [VIDEO]

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@mr3372021 · in “How to properly load a dishwasher (2020)”

So one thing that really surprised me is the little pocket on the soap tray. I started adding some liquid soap there as part of the loading and saw a big improvement on cleaning result. The idea is during the first pre cleaning cycle the soap will start working so you add the detergent on dish time. [VIDEO]

@CaliforniaKarl2021 · in “I messed up. You're using too much detergent. [video]”

This is a followup to "Detergent packs are kinda wishy-washy (Dishwashers Explained)", [VIDEO] Posted to HN at [LINK] and [LINK]

@slantyyz2022 · in “My dishwasher won’t start until I let it update its firmware over the WiFi”

Sadly, I don't think dishwashers will last 20 years any more. Since 2005, I'm on my third dishwasher. The first one lasted 9 years, the second one around 5 (with one under warranty repair). At some point the repairs/parts cost more than what the original dishwasher is worth. Regarding the algorithm, I'm not sure they make a huge difference anyways. FWIW, The Technology Connections channel on YouTube has a couple of pretty interesting videos on how dishwashers work and how to get the most out of them: [VIDEO] [LINK]

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@nrvn2022 · in “My dishwasher won’t start until I let it update its firmware over the WiFi”

here is the problem statement: 1. Get a technology proven to have solved a given problem more than 100 years ago. 2. Throw ICs on top of it. 3. Put “smart” into marketing materials. 4. … 5. Profit There is nothing in any dishwasher[0], fridge, vacuum cleaner, washing machine, $ {you_name_the_home_appliance} that would require to be smarter than they are without those (actually far from smart) hardware and software that is being installed and imposed on customers. If combined with the planned obsolescence[1] it creates a perfect combo. [0] - [VIDEO] [1] - [LINK]

@ejolto2022 · in “My dishwasher won’t start until I let it update its firmware over the WiFi”

I don't have any issues putting dirty dishes in my dishwasher. Do you use pre-wash detergent in your machine? I highly recommend you watch this video by Technology connections[1], I too used to think I had to rinse my dishes before putting them in the machine. [1]: [VIDEO]

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@chillingeffect2022 · in “My dishwasher won’t start until I let it update its firmware over the WiFi”

This[0] and this[1] are the ultimate dishwasher talks. From what I gather, European dishwashers heat the water, while American do not. [0] [VIDEO] [1] [LINK]

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@bentcorner2022 · in “How to get kids to do chores: Does the Maya method work? (2018)”

I love this video: [VIDEO] Dishwasher pods are heavily marketed in the US and actually wash more poorly compared to plain powder. With pods the pre-wash ends up running without detergent, so rinsing off dishes becomes necessary.

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@rubenbe2022 · in “I disabled WiFi on the new Samsung fridge”

I stopped using the default "eco" program and switched to the faster "auto" program on my dishwasher since watching this video on how these programs actually work: [VIDEO] TLDwatch: eco programs use only one batch of water, others use two and that results in cleaner dishes with the added benefit of a faster program.

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@bick_nyers2023 · in “Nobody needs a faster dishwasher – solve real user needs”

Dishwashers contain a heating element no? Not sure if booster powder is a specific product but yeah detergent on the little lip of the main detergent door is a significant help. For those interested, here is a wonderful 30min deep dive by none other than Technology Connections about dishwashers and detergent usage: [VIDEO]

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@lbutler2023 · in “I Splurged for the Fanciest Dishwasher and It Was Worth It”

For those that haven't seen them, the two Technology Connection videos on dishwashers are must watch 1 - [VIDEO] 2 - [LINK]

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@harrisi2023 · in “Workers with less experience gain the most from generative AI”

I've gone back and forth with dishwashers my whole life, spending years with followed by years without, etc. and I finally am team dishwasher. There are a few tips I've learned, such as immediately rinsing a dish after using (I don't bother scrubbing), running the hot water for a minute before starting, using the pre-wash detergent and shine stuff appropriately. I also don't bother entirely filling it up to run it - which may seem wasteful, but I'd imagine filling it completely and having to rewash some percent of them ends up being more wasteful. Also, just like getting a manual dishwashing routine figured out, dishwashers are all different and need to be learned like any tool. Understanding where pieces are, which cycles run when, which compartments open and close and even how they do it, are all important. It really is best to think of it as a tool. Some useful videos: [VIDEO] [LINK]

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@enragedcacti2023 · in “To Make Dishwashers Great Again? (2020)”

For anyone who is upset with the performance of their dishwasher there is a really really easy thing to try. First, replace your pods with a box of powder detergent, then add some detergent to the prewash cup on your dishwasher in addition to the normal dispenser. If your dishwasher doesn't have one you can just put some on the door before you close the washer. This gives your dishwasher detergent to work with on two of its cycles rather than just one and in my experience it makes all the difference on really difficult dishes. The pods are effectively identical to the powder detergent but at a huge cost premium and don't give you the ability to adjust your amount of detergent to match the water hardness in your area which can result in a film on your clean dishes. for more info there is a great Technology Connections video covering it: [VIDEO] Alternatively you can test this by just throwing an extra pod in the bottom of the dishwasher to start with. If it works well then you can consider switching to powder to save costs.

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@chongli2023 · in “To Make Dishwashers Great Again? (2020)”

Either your dishwasher isn't very good or you aren't using it properly. You should be using powder in both boxes so the prewash cycle and the main cycle can work [1]. Pods? Waste of money! [1] [VIDEO]

@mastercheif2024 · in “Cars suck, man”

Technology Connections’ video on dishwashers will change your life. [VIDEO] Ever since I switched to powdered detergent and started throwing a pinch of powder in the bottom of the tub in addition to filling up the main dispenser halfway, I have not had a single dish come out with a piece of food on it. I also recommend disabling any “auto” features of dishwasher has. The only caveat to this video: don’t fill up the detergent dispenser all the way with powder, go about halfway. He corrects this mistake in his follow-up video, which I also recommend.

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@zahlman2024 · in “I just found out I've been using my dishwasher wrong for 7 years”

Relevant - since there is more to learn about operating a dishwasher: Technology Connections' series on dishwashers - [VIDEO] [LINK] [LINK] [LINK]

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@codethief2025 · in “I was right about dishwasher pods and now I can prove it [video]”

I remember watching this[0] video by the OP a couple years ago. Never would have thought I could listen to someone talk about dishwashers for 30 minutes but it was surprisingly fascinating! [0]: [VIDEO]

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