I've been roasted and toasted for saying this before, but here goes again...
I wash mine in super hot water. My new-ish washer has a "Sanitary" cycle on it, where it heats the water up to darn near boiling. I've been washing my MF's in it for 2.5 years now. No problems, and very clean MF's.
Before I started washing them this way, I had a few MF's become water-repellant. I think most everyone has had a few MF's do this to them... anyway, I have yet to have an MF turn water-repellant since I started washing them in super hot water.
Lot's of guys responded with quotes and web sites from very reliable sources that said to never wash your MF's in hot water, so of course YMMV, but it sure works well for me.