We just bought a 2010 Coleman Destiny Westlake and the canvas is in decent shape (just a couple pinholes around the little canvas pop-out over the sink). We don't know when the last time waterproofing treatment was applied, but we do know that the previous owner who had it for 2 years said that he never waterproofed it. I'd like to clean it first, let it dry, and then apply waterproofing treatment. The manual has information about recommended cleaning solution and waterproofing to use. Is it possible to clean it and waterproof it without removing the entire canvas from the camper? Or would that cause a big mess on the camper box? Is removing the canvas and putting it back on afterward a total nightmare, or is it fairly simple?