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Try putting some Happy Camper Extreme Cleaner in there according to the directions and it should clean it out and take away any smell. If your local dealer doesn't stock it you can buy it directly off the website and I am attaching a link to that for you. Great stuff! Most of my customers swear by it and never use any other product. Try using RV toilet paper and that will help as well. Please get back to me if you need more as all follow ups are included in our fee. http://www.5starhappycamper.com/
Were you able to get this cleaned out? Please let me know what you think of these products...........thanks!