I just discovered this and wanted to share. I have to wash my hair every day or it gets really greasy, tried everything to stretch it out and the only thing that works is dry shampoo which is quite expensive. I'm also trying to cut down on water/electricity so don't want to wash and blow dry it every morning.
Anyway, I've discovered if you use corn starch-rub it through your hair at night (you don't need a lot). It absorbs all the oils overnight and your hair looks perfectly clean in the morning, just brush it all through.