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A comment on The afterlife of used hotel soap. Parent comment

Re:The afterlife of used hotel soap by mikequinlan on Sunday April 24, 2022 @09:45AM (#31143936)
If the soap is leaving a film, the water is hard not soft.
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Re:The afterlife of used hotel soap by bombcar on Sunday April 24, 2022 @11:22AM (#31144891)
A crust is hard water, slipperiness you can’t get rid of is soft.

https://www.usgs.gov/faqs/why-does-it-take-so-long-rinse-soa...

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