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The most effective product I have found is made by Happy Camper and is called their "Extreme Cleaner" and it is almost always 100% effective. It can be purchased on Amazon. Another way to do this is with a HydroFlush and clip on dump vavle that you can install from the outside and fush backwards to get any clog out at the tank exit. You do have to be careful when doing this. Valterra makes those. I think Amazon has those as well. You do have to be careful about mechanical means as the tanks are brittle and can be broken easily. That would be expensive. Try that and get back to me if you need more as all follow ups are included in our fee.
Directly from them on their website and your local dealer may stock it.
Just checking back in to see if you were able to find Happy Camper in your area?