Does anyone else have a problem with their DH making white pillow cases a funny colour? My DH is dark haired and washes his hair every morning. I like crisp white bed linen. As it's only on bed for a week or two max I routinely wash on 40 degrees (with Ecover) but they still come out with a yellow patch. Have tried more chemicals and a higher wash temperature to no avail. Any ideas anyone or am I on my own with this odd problem? past co-habitees have not done this to my pillow cases just DH