I too am using off the wall press. While I am using some pretty hefty weight, some whey sprays out of the drain holes in the mold, so we need to wash the tile wall and the floor. I found stainless steel pizza pans, cut a 1/2" slot out of one side and the bulk of the whey drips from that into a Tupperware container on the floor. I'm probably lucky to get 75% of the whey to actually find its way to the container, the rest is cleanup.