That's the question.
The water from the bath tap is fine, I have been using the "telephone" thing to wash my hair and everything is ok.
However, if I use the shower, it is a completely different story, I can wash my hair three times and it looks worse than before I started . It feels as if I had applied handcream to it. Well, kind of.
Any clues? it is a mains shower powered by a "new" combi boiler. Having said that... other taps in the bathroom do not seem to have the same problem...