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We ahd a terribel smell a few years ago which was coming from the sink in the bathroom. Cured it by puttin a mixture of washing soda and liquid biological clothes washing detergent down.  Then put hot water down and drove around before emptying.  Resigned to do this occasionally, buta as often happens, the routine gradually stopped.  However, we've had no more problems.  We stopped using soap for hand washing and use a liquid hand wash now as soap traps the dirt and the fat in it clings to the inside of pipes and the tank. 

Now you've reminded me I will put my mixture down the sinks before we set off next time.

Jean