When dumping the tanks, do the black tanks first, then the gray tanks. This way the soapy gray tanks water will help clean out the sewer hose.
RV Sewer Hose flush
This post may contain affiliate links, meaning I get a commisson if you decide to make a purchase through my links. There is no addtional cost to you. See Affiliate Disclosure
If you like the website content, be sure to sign up for my *free* monthly newsletter. In it, I share a little more personal information about our journey as full time RV/Boaters, links to the latest Love Your RV and Boat! posts/videos, and some other helpful bits and pieces.