We have owned a 4 seater habitat sofa for 10 years. Super comfy but beige and now 2 DCs and a cat later, it's super stained. DH put the covers in the washing machine earlier with two packs of antique grey Dylon dye. But instead of dyeing, it's gone all blotchy! Why? Could there be something on the material stopping the dye taking? We've had the covers dry cleaned before and I've washed them on the delicate cycle of the washing machine before... Is it ruined? Help!