I have a light grey breathable ground sheet. I now wish it wasn't light grey but it is. Have any one got any suggestions how to get it clean. Over the years ( about 4 now) I've used it and managed to gather new marks or stains which I have been unable to remove, I've tried soaking in washing powder, bealch etc but none of it worked. My wife said try a pressure hose which I am reluctant to do as it might rip it apart. I will do this as a last resort before deciding it looks horrible enough to go and buy new. A warning to anyone going to buy a ground sheet of the breathable type, DO NOT BUY LIGHT GREY. Any help with this would be appreciated. Thanks Mike