To use your Sferra Giotto King Duvet Cover, simply slip your duvet inside it. When it comes to cleaning, you can machine wash it in warm water on a gentle cycle. Avoid using bleach as it can weaken the fabric and cause yellowing. Also, don't use fabric softener. Wash dark colors separately to prevent color bleeding. Tumble dry on low heat and take it out while it's still damp. If you want to bring back its luster and sheen, you can iron it on the “cotton” setting.