[namelosw]

Taking 'hard' water for granted since I was born, it's quite surprising and interesting that water cannot rinse off the soap.

This year I went abroad for a business trip. In the hotel, after washing my hands or taking showers, I found I couldn't rinse off the soap. I was so confused because it was so hard to do it, plus I brought my own soap. I inspected, smelled, and tasted the water carefully and didn't find any difference. In the end, I learned there is such a thing called 'hard' water.

[Delk]

I live in an area of "soft" water. I knew of the concept but I had no idea it affected the rinsing off of soap. I had also never noticed that soap might have rinsed off easier when traveling. (And even if I had, I'd probably just have assumed the soap to be different.)

Conversely, I suppose the buildup of limescale might surprise me if I were to spend time in an area where water is significantly "harder".