Z.A.
In the USMC I learned to toss them in the washer by themselves (on high, cold or warm water) with about a cup of bleach. Obviously, don't put them in the dryer.
<Laughing> While it was a weekly thing then (we weren't allowed to go out and party on the weekends unless our rooms were surgically clean) we do it once a month or once every other month now. Even if there doesn't seem to be a hint of pink, when they come out of the wash...wow. Okay...so apparently I just don't SEE the pink starting.
We only ever have to throw them out if the cat climbs up it, or the kids tear ALL the holes beyond repair. It's pretty easy to melt new holes, but only if you haven't done it 3 times already.
We're on the same plastic liner now that we've had for the past 5 years. (Only one hole has been replaced) The water is never TOTALLY gone from the spin cycle...so be careful not to drip on anything.
Easy easy