If it is more appropriate for Chemistry Stack Exchange, please let me know, although it happens when I am traveling.
I am very thorough when washing my hands (I prefer bars of soap to liquid soap), and I noticed that, in some places I have traveled to, I couldn't wash my hands very well: after lathering my hands with the soap, I cannot wash it away. No matter for how long I keep rinsing my hands, they remain soapy/slippery.
This does not happen everywhere I traveled to, but when it does, it appears to happen anywhere I wash my hands in a given city, making me think it might be something with the water: maybe the city's water is rich in minerals, or poor in minerals, or something similar? I should mention that I do not think it is from the soap, as I usually use, at least in the hotels, the soap I bring myself on trips (as I hate hotel's tiny soaps, except as a souvenir); I should also mention that my family thinks I am crazy and this actually is all in my head, so maybe it is about the interplay of the water and my skin's own chemistry? Or it could be because I wash my hands so obsessively, so it is easier for me than for them to notice.
What is going on? Is there a way to avoid that happening?