Can cellular fabric shades be cleaned?




Over the winter our vacation house had a furnace malfunction, what I'm told is a blow back. It resulted in the whole house and its contents being covered in soot. I've been painfully washing everything that we could save and since the fabric cellular shades are expensive, I wanted to try to save them as well. Does anyone out there know if how to clean blinds made of fabric? Thanks S.A.N.
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I've used the bathtub method, as well. Used laundry detergent as well as vinegar, with success.
However, if my cellular shades are really dirty, Oxyclean (or any generic version), works a treat. For some reason, the powdered oxygen-based detergents get stains out of my cellular shades, like nothing else will.
I've used the bathtub method and it made no difference. Here is a photo of the white vs. the staining. I have no idea where this staining came from.