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.