I have just brought my Troll home from storage after a year of non use, sob. Anyway I am in the process of sterilising the system including on board water tank and thought I would check the pipe which feeds the onboard water tank from outside as I can’t get enough wster in the system to soak that overnight. I was surprised at how dirty, probably mouldy it was so used a large pipe cleaner to clean it then poured sterilised water through it . Worth checking if you have an onboard water tank.

I use Puriclean too, saw it on this site, good stuff.
I've left mine in overnight and flushed out today ready for our 2 weeks outing to Betws-y-coed in 2 weeks time, hurray

We also use puriclean. However, we only ever use the onboard water for hand washing or dishes. Never for drinking. We usually take a 5 litre container of bottled water with us and once that's finished top up from an outside tap. I also have a separate container for the dog's water.