Wash with any ole non scented detergent, DDW is what I have used lately. Dry with an earth scent dryer sheet, and then into the large ziploc bags, just like GMMAT.

They are literally Ziploc Bags, size xxl or something, rather big and come in a 3 pack for like $5. Just seal them all the way across leaving the last 2-3 inches, then press on the bag pushing air out, once it is somewhat compressed, seal off the last 2-3 inches. Now the clothes are stored air tight with no scent getting in. I can usually get a season out of the set of three bags, but if they wear down, which they do, another pack can be had at walmart for another $5.

I wash atleast after every day of hunting, and if I head home between hunts Ill try and wash then. Depends if I sweat. Sometimes when I get back from the AM hunt to the truck, Ill remove all layers except the base layers and place back in bag and seal up for afternoon hunt. I just wear a different set of or wash my baselayers before heading back out. Sometimes I get lazy and go a whole weekend without washing, sometimes it is before every sit. Usually every night, after using for both an AM and PM sit.