You can washem, soak em, boil em...But they are on the cheap side of things, so replacement tends to be easier. I boiled my first batch (after soaking, after a grow), never ever again... A very smelly experience that lingered on forever...Thats just my .02
Damn, son. I wish I could throw away $800 worth of balls because they were dirty! You all must be rich or have little tiny systems.
You can throw them in a tub or rez, fill with water, add H2O2 to sanitize them. You can rinse them in a bucket with holes in it or a big net pot.