His advice? "The closer you are, the better. If you can get stream impact with the porcelain, it's a lot less chaotic."
Of course, in a domestic bathroom, distance from the toilet is governed chiefly by one variable: "to stand or sit".
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Above all, he says, "the biggest thing you can do" to reduce splashback - sitting or standing - is to alter the "angle of attack".
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But Prof Truscott says one of the most effective tricks is also the simplest - drop a few pieces of tissue into a toilet bowl to soften the blow.