Wanna, you can buy that pretty much anywhere. It's cheaper if you DON'T get it at a tack shop.
I have sueded half chaps. Once or twice a year, I wash them. Delicate cycle, with just a smidgen of liquid detergent. NO fabric softener during the rinse cycle, and hang them to dry. Once they're dry, brush up the nap with a stiff brush.
If you have smooth leather half chaps, best to use a foaming leather cleaner because washing them won't work and will damage the leather.