I haven't got time to take it to the dry cleaners as I am wearing it on Friday, it's been hung in a steamy bathroom and still creased,any tips as to how to get the creases out? it's viscose/polyester mix (I think) and the material design is crinkly so dare not iron it but is creased across the dress where it was stored,help needed as I don't want to look like a rag-bag!