Glad you got them clean.
Personally I once considered the dishwasher idea, but I was too chicken. So I ran a sink of (very slightly) soapy warm water and dipped the minis in using a large pasta strainer. Swished them around a few times, rinsed well with the sink sprayer, and spread them out (protected from the cats) to dry for a couple of days. It worked very well for about 200 minis.
One of these days I need to get around to cleaning my whole collection. I keep all but the Huges in boxes and bins, but (as someone mentioned) about 75 percent of the Unhallowed set exudes greasy dust.