Horswispr

If you don't mind a bit of work, try removing them from the frames and soaking them in warm water and your favorite cleanser. But then you have to reattach them with a glue gun. Larbor-intensive and requires a lot of concentration to get the lines right. There ARE fabrics out there that are fairly close (but not identical). Check your local fabric store. The ones I use when the originals are toast are close to what KLH used on their 17s.