Looking to wash microfiber cushion covers.?

I bought my sofa from rooms to go it's a microfiber sofa and chaise. I need to wash the covers my daughter got some milk on the covers, I cleaned it with the fiber protector they gave us but I notice that it left a huge ring stain. so my question is can I wash the covers in the washing machine? If so what settings? Soap or no soap? Dry or no dry? If you would like to look the sofa up its at rooms to go.com and its the Gregory 2 Pc Sectional they have a note about the cushions and pillows it says. Cushions/Pillows 100% Polyester
Base 10% Polyurethane, 70% Poly Vinyl Chloride, 20% Polyester

I would say getting it dry cleaned would probably be the safest bet.

Looking to wash microfiber cushion covers.?