No issues here. I wash my uniforms with Sport Wash (a capful per load, bought on Amazon.com) and nothing else. No bleaches, no fabric softener, nothing.
Amazon.com: Sno Seal Sport Wash 2 Liter: Sports & Outdoors
I've worn the lightweight Honig's pants for every varsity game and for many of our sub varsity games (we either wear shorts or pants, never knickers).
There is a non-trivial amount of spandex in the lightweight pants. I never use bleach of any kind (Clorox 2 is just bleach at a lower concentration that's *usually* color safe) with my officiating clothes. Hell, even for our normal clothes, we don't use any fabric softener other than a 1/2 cup of white vinegar.