Here’s a couple examples from my life:
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Safety Razor. I get a better shave and it’s like $15 for 100 razor blades, which lasts me a couple years. Way way way better than the disposable multi-blade Gillette things, which sell 5 heads for $20.
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Handkerchiefs. I am prone to allergies, so instead of constantly buying disposable tissues, we now have a stack of handkerchiefs that can just be used a few times and then thrown in the wash. This has also saved me loads.
What about you?
If you have a dishwasher, do NOT rinse things before putting them in. Just scrape off the bits into the bin. A big part of the efficiency of a dishwasher comes from not running more water or the water heater unnecessarily. If you rinse you might as well hand wash.
Also, use the cheap powder and make sure to use it in the prewash phase.
Good tech connections video: https://youtu.be/_rBO8neWw04