What should I use to wash cycling clothes? I know the labels say to use "delicate" detergent.  Well, how exactly do I know if its "delicate?"  I used to use Woolite, but then read somewhere that I shouldn't.  (Article didn't say why.)  So, what's best for cleaning them?
For cycling clothing made of synthetic materials (lycra, spandex, etc), a modern, high efficiency washing machine, or even a normal machine on a gentle cycle, is the way to go:


Cold water mild detergent or "athletic" clothing detergent. 
Gentle cycle and cold water. Optional, pre-rinse with 1/2 cup white vinegar. 
Hang to dry.


For expensive wool:


Prior to having a high efficiency machine, I hand-washed with a wool specific detergent.
My current machine has a wool/gentle cycle. I use that now with an appropriate detergent. 
Lay flat to dry. 



  Well, how exactly do I know if its "delicate?"


The detergents are usually labelled as such. Generally, detergents labeled, "cold water" will be fine. The bike shop guys will say that you need to use "special" detergents. Nah. Any cold water detergent will be fine.

FWIW - I have 10+ year old jerseys that are perfectly fine. The shorts and bibs don't last so long, and I figure it's the wear and tear.