Washing a tent? in Equipment Reviews & Discussions Posted April 12, 2006 I get a product through my shop that we use inside cars when they get wet and sour. It is put out by Marco. It is an enzyme digester. The hospitals use it for odor control. We had a sleeping bag that got left out of the trampoline that a cat used as a litter box. The smell wouldn't wash out. I finally sealed it in a bad and sprayed this stuff all in there. No more smell. We started using it about 20 years ago whem a customers car was in a flood. The insurance sent it out and had the entire interior cleaned. But when it would get hot the smell was still there It took about 4 treatments. We would sit the car in the sun. Spray the carpent until they looked white, roll the windows up and let it sit. We did this 4 days in a row. The customer still has the car and no smell.