If you are still struggling to find a product large enough then this type of rubber backed washable mat is perfect. You can cut it to fit either way up and wash them when they get dirty. You Just need to shop around for the cheapest
(google 'Washable Doormats') sherlock
http://www.amazon.co.uk/s/?ie=UTF8&k...sl_17fh0fmyr0_b

http://www.lakeland.co.uk/p20124/Super-Absorbent-Microfibre-Mats-and-Runners



http://franks4x4-solograndetour.blogspot.co.uk/
Combat Stress-http://www.justgiving.com/Roadster100