A slime remover consists of a granular material which comprises, as the active component, particles containing magnesium oxide and/or magnesium hydroxide and calcium oxide and/or calcium hydroxide either each alone or mixedly and/or particles containing a composite of both components, the content of magnesium oxide and/or magnesium hydroxide in the granular material being 50.0mass% or above in terms of magnesium oxide and the content of calcium oxide and/or calcium hydroxide therein being 0.1mass% or above in terms of calcium oxide. The slime remover can remove slime formed on a solid surface, said slime containing both bacteria and excrement thereof. When the slime remover is applied to a drain pipe with slime adhering thereto, the drain pipe can be kept in a slime-free state over a longperiod.