I have just bought some 600 tc sateen bedding in white. It isn't the most expensive out there but I would like to keep it white. I use a powder detergent along with a scoop of astonish. If I saw any stains I would treat them prior to washing. When I iron I noticed a couple of small marks, one looks like a coffee mark, the other just a random spot of colour, I would never of seen these prior to washing. What is the best thing to wash with. I often wonder how hotels keep their bedding clean.