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This tip is probably fairly well known but if you use a SOG toilet the task of emptying it can be made slightly less unpleasant by adding a capful of biological laundry liquid to the toilet after you have emptied it. The enzymes in the liquid do reduce the smell quite significantly and the perfume which most of them have helps too. Whilst not completely removing any smells it certainly helps. You can also use the versions which come in sachets or tablets but I have found the cheapest liquid one works fine.