I have some lovely handwoven cushion covers that I bought abroad. One has been on my sofa for several months and has faded a lot in that time, whereas the cushion covers I bought from John Lewis have not noticeably faded. I’d like to put the other handwoven cushion covers on my sofa, but would really like if possible to make the dyes more durable first; does anyone know of a product or company that would do this, please?! 