For the boots anyway...if suede/cloth exterior, spray heavily with something like Lysol and then let them dry out in the sun. If leather you can clean the outside with a good quality leather cleaner..several times, but the internal odor will still need a heavy dose of deodorizer and preferably sunlight in which to dry.
I am guessing the boots got wet on a routine basis and drying was either not complete in between and/or they were allowed to dry in a closed in area like a closet, tack box or tack locker.
The odor inside will fade with regular treatment but it will never go away entirely. Wearing good quality socks that wick away moisture will help as well as using an insert, like Odor Eaters.
AS for chaps, not sure why they would develop an odor but, if washable (check the tag), just toss them in a regular washing machine with regular detergent or if washable suede, with a suede detergent, and then allow to air dry. If leather, again, use a good quality leather cleaner/conditioner. If suede, post-wash spray the heck out of them with soemthing like Scotch-guard or another suede protector.
Last edited by tlkng1; 11-09-2013 at 08:34 AM.