Vacuum thoroughly, spray with APC until damp and scrub with upholstery brush. Allow to sit for 5-10 minutes. At this point I usually soak the mats with the hose, rescrub and rinse thoroughly with the hose. Hang to dry and then vacuum to raise the nap. For the carpets, spray with APC, scrub with stiff brush and wipe with towel. Lightly mist the carpets with clean water and wipe down again so you don't leave any APC residue on the carpets as it will actually attract dirt.