Just like the title says - I got some grossness on a pair and wondering if doing this with some bleach will ruin them? Don't really care how they look afterward as long as they still fit and are functional.
However, washer is great. I throw mine in on a gentle cycle with leather therapy wash, and a couple of old towels. Do an extra spin cycle to "dry" them and then slather with conditioner while wet and lay out to dry in a cool place. I've done this with Ariat and Treadstep 1/2 chaps without any problems.
"I may not have gone where I intended to go, but I think I have ended up where I needed to be." - Douglas Adams
i've thrown my suede full chaps in the washer before with no ill effects. (i let a friend borrow them and they stretched a bit!) i just used regular detergent, warm water, laid them out flat to dry. they didn't really shrink, but did 'tighten' up a bit, so just be aware of that if your chaps are anywhere near being too tight already. they came out fine, didn't dry or crack, and were nice and clean!
I wash my suede stuff all the time. I would not however, recommend bleach. I use pepede leather wash. It is really great stuff! There is a link to it below from smartpak. Just a warning though, the leather comes out a bit on the stiff side but nothing bad enough that one or two rides couldn't fix. Also the leather usually shrinks just a bit, so if they are already a little tight on you, it could be hard getting them back on after washing.
I have washed mine in the machine using Pepede and they come out looking like new, but I would not use bleach. If they are a little tight, just put them on over bare legs and walk around the house for a few minutes, that's all it took to get my Tredsteps back to normal, there was no significant shrinkage.