So I made a real big mistake and left my blue Edge 2k blue pad outside on our deck. It rained, and it has gotten a bit dirty...what is the BEST way to clean this up to at least better than it is now...I don't think that there is any product in it, but it just looks really dirty, as in dirt maybe??...I've searched, and haven't found a definitive cleaning method for the Edge pads, only on the various other pads like the LCs, etc. Any and all suggestions would b greatly appreciated.