Sterifab is what exterminators use for bedbugs. Ideal treatment is to spray once a week for three or four weeks.
This stuff is hostile to life as we know it. Including people. You need to wear a mask and/or take frequent breaks. If you get short of breath or light headed go all the way outside, not just in another room. You need to air the place out after you spray (even if it's cold) and you need to keep pets and children away until it is completely and totally dry.
Move all your furniture about a foot away from the wall and spray around all the baseboards, under all your dressers and such, and spray your beds and chairs, too. All the little nooks and crannies they like to hide in.
edit: Dry/wash/dry all your clothes and bedclothes at the same time. Anything you can't wash, seal up in garbage bags for a month or more. (If you just wash them first, the bugs will just crawl above the water. Dryers will kill the living ones, then you can wash and dry them to remove any eggs.)
Love it, but I'mma be a debbie downer for a hot second---did you treat it with anything before bringing it inside? Bugs (bedbugs, roaches etc) will absolutely hang out in that kind of material.
I'm a REALLY big fan of SteriFab, which is technically for upholstery but would work for this, too. My dad used to be the manager of a furniture store warehouse, and when furniture got repossesed, that's what they would use to treat it before putting it in the 2nd hand sale room.
I used sterifab on everything I bought second hand when I was living in DC b/c there was kind of a bad bedbug problem going around, and we never got them :)