to allow water to flow into the drain in the case of the surface being made from a series of smooth bumps this will not be a problem since the individual bumps will inherently provide passageways between each bump if the surface is made as rows of undulations there should be passageways between the rows to allow water to flow into the drain 10 also there should be a ridge 16 see fig3 around the perimeter of this surface to catch excess water and prevent the water from flowing onto the floor on the other side of the rollers 2 from the undulating surface 9 is a small door 12 hinged at 17 see fig2 to the top of the washing machine lid which can be opened by pulling up on knob 11 this door can be used to put clothes into the washing machine or it can be used to put detergents or other laundry cleaners into the machine the door could have a conventional catch not shown to hold the door closed when the washing machine is in use to prevent water from escaping from inside the machine the door should also be equipped with a conventional safety switch not shown so.