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Re-stuff Sofa Cushions / Clean upholstery

8 year old sofa from American manufacturer Pottery Barn. 2 seat cushions and 2 back cushions looking saggy and deflated. Would like to refill and clean upholstery which is a microsuede fabric "Pottery Barn Performance Everyday Suede" Original filling down blend wrapped seat cushions (see photo - muslin covering torn) and 100% polyester fill in back cushions. You would need to provide the materials as we have no idea where to get them. Would like cushions filling to be as original done - not a chunk of foam or polyester batting stuffed in. Thank you!