I wash them each time. I only buy cheap ones like Asda basics, and if they start getting really grotty I just chuck them out and buy more. For something really messy I have been known to cover them in foil and just chuck that instead.
I do the same GC. They are cheap enough to replace .
I also buy cheap ones and replace them quite frequently.
So the Chinese have NOTHING to do with the world shortage of steel then!