Detergent packs are kinda wishy-washy (Dishwashers Explained)
Technology Connections15 HN recommenders · recommended in 12 months, 2021–2025
explainer · general · evergreen · 2021–2025 on HN
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.
Up next
8 mo on HNI messed up. You're using too much detergent.
Technology Connections
10 HN recommender · 2021–2025
5 mo on HNYour dishwasher is better than you think (tips, tricks, and how they work)
Technology Connections
6 HN recommender · 2024–2026
3 mo on HNHow the Fed's "Money Printer" Really Works
Ben Felix
2 HN recommender · 2020–2024
11 mo on HNStroads are Ugly, Expensive, and Dangerous (and they're everywhere) [ST05]
Not Just Bikes
12 HN recommender · 2021–2025
3 mo on HNWho Is Responsible For Climate Change? – Who Needs To Fix It?
Kurzgesagt – In a Nutshell
3 HN recommender · 2021–2024
9 mo on HNThis Video Is Sponsored By ███ VPN
Tom Scott
9 HN recommender · 2019–2026
7 mo on HNWhat People Get Wrong About Dense Urban Living
Oh The Urbanity!
4 HN recommender · 2022–2024
2 mo on HNDistinguished Lecturer Series: Building Science - Adventures in Building Science
Berkeley Lab
2 HN recommender · 2019–2021
8 mo on HNBuilding a realistic artificial sun (for dark winter days)
DIY Perks
9 HN recommender · 2020–2025
4 mo on HNBest fan placement to move air through the house
Matthias random stuff
4 HN recommender · 2021–2025
4 mo on HNMaking Infrared Cooling Paint From Grocery Store Items (w/Novel CaCO₃ Microsphere Synthesis)
NightHawkInLight
5 HN recommender · 2023–2026
4 mo on HNWhy Air Quality Matters
David Heinemeier Hansson
3 HN recommender · 2018–2024
12 comments from Hacker News
Technology Connections’ video on dishwashers will change your life. ▶ this 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.
For those that haven't seen them, the two Technology Connection videos on dishwashers are must watch 1 - ▶ this video 2 - link
I love this video: ▶ this 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.
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]: ▶ this video
This[0] and this[1] are the ultimate dishwasher talks. From what I gather, European dishwashers heat the water, while American do not. [0] ▶ this video [1] link
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]: ▶ this video
Relevant - since there is more to learn about operating a dishwasher: Technology Connections' series on dishwashers - ▶ this video link link link
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: ▶ this 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.
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: ▶ this video link
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: ▶ this video
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: ▶ this 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.
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: ▶ this video link