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I usually recommend Happy Camper Extreme Cleaner. If your local dealer doesn't stock it you can buy it directly from the manufacturer in Medford, Oregon. I am attaching a link to that site. Sometimes a "clog" is that the pin has sheared on the macerator shaft. Hope that isn't the problem as that is messy to repair. https://www.5starhappycamper.com/
You are correct...........long day here. I will opt out of this and allow another tech to offer something. Being that it is the 4th I don't know when that might be.