I hurriedly packed up my Kodiak Canvas tent just after the snow event in Colorado earlier this week. There was some mud and dirt on the floor. This mud and dirt is now on the walls and roof. I have spent several hours trying to clean the walls and roof with clean water and an old towel. I wipe with the damp towel and rinse in clean water over and over again. When wet it looks pretty clean, but when it dries it still has stains. Can I use a mild soap, something like a liquid hand soap or something to remove the stains. If so will it reduce the water repellent qualities?