Ok, if you are at a campground, when you are packing up and ready to head home,
empty the tanks, listen for when they are finished running, close the black tank valve and go inside and open the toilet and hold your foot down on the flush pedal and watch for the tank fill, I fill mine to the top and when it gets full go out and open the valve and wait until it is done, then go inside and do it all over again.
Last trip of the season I do this 3 times, if you have a black tank flush inlet on your camper search on youtube to see how to use it.
I also recommend getting some aqua Kem bottles, they work wonders and it seems to be instantaneous. LOL which is nice, I wouldn't have survived the Black tank ordeal for 6 years without it. after you flush and at various times, ad some in, even while you are camping, I leave a little in the bowl and it takes the odors out very quickly.
You also can use a flush wand this would work great but I never had one, the tanks flushes seemed to work well with my Kodiak, I have a flusher port on my new camper so i will be using that.
2016 Shamrock 23WS