How do you get the funk out of polypro or other synthetic sports fabrics?

(And do not tell me to play classical music for them.)

The wicking, breathable fabrics used in a lot of sports/hiking gear are great, but if you own any of these clothes, you know that after a while they develop a funky odor. Do you have a laundry trick that helps cut down on or get rid of the smell? I was thinking about soaking in baking soda or adding it to the wash. I can’t use perfumey laundry soaps (and wouldn’t want to go hiking smelling like fake flowers anyway).