Most manfacturers of toilet chemicals make cleansers for toilet soil tanks and grey waste water tanks but these are usually a one off job. start of season I fill fresh water barrel with tap hot water and half a bottle of Milton or Jeyes baby bottle sterlizer put on handle and give a good roll, empty and flush with freshwater. toilet tank tap hot water slug of lime scale remover and good shake, empty and flush. and add blue fluid (I prefare Blue Diamond has nicer smell) I also check tank is completely empty when dumping contents and give a good flush with plenty water this takes smell away before recharging with Blue Diamond. and smear trap rubber seal with olive oil. grey water waste tank several times a season fill with hot water half bottle milton close all lids and give good shake(If you can lift) if not give good push back and forth if on wheels leave for 1/2 hour empty and flush. MIlton Jeyes can be bought at Home Bargains B& M Yorkshire Traders for 69 to 75 pence for a 1250 ml bottle similar price for 1ltr lime scale remover.
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