@Niels I clean them with hot water with good results. When they're dead I just replace them like you say.
I don't use tubes often these days but it's pretty cheap to just buy valves as long as you don't buy them from Stans.
Sometimes you can find huge packs on EBay. I've bought a 10x pack from Kenda before:
[http://www.jensonusa.com/Kenda-Presta-Valve-Cores](http://www.jensonusa.com/Kenda-Presta-Valve-Cores)
May 10, 2017, 2:46 p.m. - Andrew Major
@Niels I clean them with hot water with good results. When they're dead I just replace them like you say. I don't use tubes often these days but it's pretty cheap to just buy valves as long as you don't buy them from Stans. Sometimes you can find huge packs on EBay. I've bought a 10x pack from Kenda before: [http://www.jensonusa.com/Kenda-Presta-Valve-Cores](http://www.jensonusa.com/Kenda-Presta-Valve-Cores)