I use Sport Wash. There's another brand that's similar, but I can't remember it's name. I'll try to come up with it. Always good would be any pure soap detergent.
Sport Wash can be used in HE washers and has been muy effective for me. A possible problem with regular detergents is that your nads may not get on with any residual products in the chamois, under the heat and pressure of time in the saddle. Also, certain materials don't do well with regular detergents (I'm not a textile guy, so I'm not sure why.), and the stuff in chamois could be some of those materials. I dunno.