We have a Manstad Ikea sofa bed. The seat cushions cannot come off and the fabric cannot be removed. Whenever I try to wash it with a soapy cloth or brush, it leaves big ugly water ring stains. It is so ridiculously dirty, though.
Any suggestions are much appreciated!
Here's the link with fabric specs for more info: http://www.ikea.com/us/en/catalog/products/90198978/