Keep each pair in an airtight box, away from other accessories. The fabric base can pick up color if pressed against other pieces over time.
When it needs a refresh, wipe the surface with a clean damp cloth. The paint is built up in layers. It won't come off.
Avoid prolonged water exposure. A splash is fine. Don't wear them swimming.
Three rules. That's all it takes. These are made to last - I've made sure of that.
Aneja