Oooh I lurve my Vileda! (in fact when i saw the thread title I thought I'd have to come in & post how much I love them, how sad is that )

If they've only been in use a little while there's a couple of things you can do; you can zap them in the microwave for a minute or so to steam them & kill a few germs that way. Or if they are a bit manky (my kids leave them bundled in a wet heap so they get a bit whiffy, YK?) I soak them in the sink in vinegar & they come up good again.
Once they've been kicking around for a bit i chuck them in the washing machine with other towels / cleaning rags & then use them for the bathroom & general cleaning. They are actually good for quite a few washes, they're really tough.

ETA - I could never go back to using chux; I tried once & they just don't feel substantial enough & I ended up going through them so quickly. And then they tear & get holes & stuff, and you can't wash & re-use them - eurgh.