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we use the green stuff - you can just put it in the top and flush it through a few times before using. Usually quite cheap without being on offer. Only no. 1's though.

Try not to use any really harsh chemicals that aren't for this purpose as it can break down the rubber seals quicker (i read that on here somewhere).

I have a few friends who live in there caravans and thats what they use. Never had any problems and have been using them for years. I have not had any problems so far either both when on the cistern blocks or the toilet duck discs.