We use some kind of hippy environmental stuff that comes in little things that look like sweets, and wash at 30 degrees. Oh and I dry them on the line if possible – things are way more fresh after drying in the wind.
For commuting (I do quite a long commute too, although not 250 miles of commuting in a normal week), I have 6 polaris jerseys, which I wear for one day each then wash. I just wear normal shorts, so can't give advice on them. I find that as long as I wash the jerseys and only wear em for one day it is okay.
I have had one jersey that got tainted with the demon whiff – after a very very muddy tough guy race (basically it was 8 miles of running through mud pits and crawling under nets in mud etc.). I think once they have it, it's hard to get rid. There doesn't seem to be any correlation between expensiveness of jerseys and tendency to smell, so I'd buy cheapish ones if you have a problem with smell (decathlon do okay quality cheap ones), I only have fancy £40 each polaris ones because I got em dirt cheap in a sponsorship deal a while back. It is worth trying a too hot wash with your jerseys if they still smell after a normal wash though, I know some people do that every so often.
Oh and probably obvious but I always start out a ride a bit chilly, rather than wearing tons of jackets etc. so I don't sweat too bad except in summer. And I have a saddlebag for my gear, so I don't get a sweaty back.
Joe