Join Date: Nov 2010
Location: Along the Rivers of Pittsburgh
Bikes: 2011 Novara Forza Hybrid, 2005 Trek 820, 1989 Cannondale SR500 Black Lightning, 1975 Mundo Cycles Caloi Racer
I spent 2 days on the GAP Trail, in the rain, on a hybrid without fenders (mudguards, whatever-you-want-to-call-them). I wore Champion C-9 t-shirts which to my eye appear to be made of the same material as most bike jerseys. Both came out perfectly clean with a normal washing.
As the head laundry person in our household, you might want to consider pre-soaking your current shirts. This has worked wonders with some of the dirt our kid gets into. I'll use either Oxi-Clean or even just normal detergent (we use Tide-Free). With some of my kid's clothing, I'll let them soak for days with some pretty amazing results.
Keep in mind, though, that soaking will take out color if left long enough. But since you're wearing white to begin with, this shouldn't be a problem.