How are you cleaning scale buildup Raritan electric toilet?

Nov 6, 2020
147
Mariner 36 California
I was having backflow issues on my Marine Elegance electric toilet, so ordered new joker valves and replaced this weekend. When i pulled them i realized the problem was scale buildup on the valves. It wasnt even that much so got me thinking that i should be able to treat/flush the lines every so often to keep them clean instead of having to pull them every year.

Curious if anyone is doing something similar and what is your recipe/technique? How is it working for you? I was thinking of using some Barnacle Buster (phosphoric acid) because i have some on hand, flush a pint or so, let it sit a few minutes, flush another pint, let it sit and flush with clean water. Im not so worried about cleaning the hoses or inside the macerator etc...as much as i am just getting the two joker valves cleaned. The openings in these valves looks fairly delicate and seems easily clogged. I'm thinking cleaning once a month might be a good idea.

recommendations/advice?