You can put your oven on a very low setting, such as 250 degrees, to dry out the fabric you have. It should only take about 15 minutes to accomplish. Then test it. But, also look at the color. IF you do see brown anywhere, it was not cooked enough, and you need to put it back into a closed can, and heat it up above its flash point in that oxygen starved can. That is how all charcoal, and charcloth is made. Put a small hole in the can to allow the steam to get out, and simply watch that small curl of white smoke coming out of the hole. When the smoke stops, the cooking is usually done. However, if you have packed the can full and tightly with cloth, to get all the air out, you should leave it cooking for another 20 minutes to insure that all the fabric is fully charred. Do this kind of cooking outside, as the smell will win you no friends indoors.