So today by accident I washed my hair with soap...

[toffeeboffin]

And it looks amazing

Just plain white handsoap, thought it was a shampoo bar.

I have very greasy hair usually but this morning it is almost fluffy

[giraffesCantReachTheirToes]

I've washed my hair with hand soap when I was in hospital once and no one could bring me anything until the next day. It fell in beautiful glossy ringlets. I think that was to do with the humidity too. My hair seems to naturally dry nicely in hosp.

[Deathraystare]

My hair used to be very greasy. I wanted to get Lush's shampoo bars but indesperation found a shampoo soap at the chemist. I wondered why the SA kept smirking. When I got it home it was for headlice! Did clean my hair but was then dry!

[Gah81]

It may well have got rid of any build up you may have had. I have dry hair but every so often (about once every few months, or when I notice it's getting greasier more quickly than usual) I will wash it with Fairy Liquid to get rid of product build up.