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The best thing I have found in my shop is Happy Camper Extreme Cleaner. Works great. Availble on Amazon if your local RV shop doesn't carry it. Use that and get a clip on waste valve and Hydroflush from Valterra and that can help break things loose from the outside. Amazon should have those as well. Hope that gets you going......no pun intended! Please get back to me if you need more on this as all follow ups are included in our fee.