I have a 2000 Sundowner with the floor covered with whatever they used. With that cover I have never been too worried about cleaning. I use sawdust (pellets)in the trailer to absorb urine, etc. Last year when I pulled the mats to clean I noticed a little slit in the cover. So today I pulled mats and cleaned and found a couple of big slits. So I ripped up the cover and found the sawdust had gone everywhere under the cover. Some of it is so ingrained in the grooves and I could not get some of it out with the pressure washer. A lot of the floor is also discolored. What is best to clean the floor with? Am I just looking for little pinholes?