My MCNs have lost their waterproofing so we use PVC covers (long story).
We also wash in warm water, but that's our choice. Probably will switch to cold once we move to our own place.

I've never strip washed, I just use Omo.

Also, we've always used liners (just the homebrand ones) because it makes DD feel a bit dryer. We don't throw them out everytime if she just has a pee, we wash them with the nappies. They last a few washes. If they are poopy, they go down the toilet.
It saves alot of stains and trying to rinse poop off the nappy.