I usually wash my hair every 2nd day, but on the second day I usually have to wear it up or put a headband around it as it just looks like a shiny wet blob - waaay too oily. When I worked I'd wash it 4 out of 5 work days. When I was pregnant I could go 3, maybe 4 days between washes, which was awesome! Occasionally, I'll go a third day if I'm not going out, just to give my hair a bit of a break. I use Head and Shoulders and an organic daily shampoo 50/50 as I also have a dry scalp. After I've had foils, I use a colour last shampoo and can go maybe an extra day between washes for the first couple of weeks as the colour dries my hair out a little. I found an oily hair shampoo makes my hair oilier, as a pp said. I have seriously considered shaving it.... it couldn't possibly grow back any worse....