All right everyone, stop your griping, whining and complaining because I have the ultimate solution. Do as I do every year as an end of season ritual. Eat some chili the night of your last boating, the next morning brew a nice strong cup of coffee and then lay a dugan in your rig. Immediately put a storage cover over it and I guarantee you no cat or other animal will ever break in to scat or pee.
Next year wash out at confluence park-it can't make the water any worse. As a matter of fact it may well help the water quality there.