A cleaner includes at least two cleaning brush members to electrostatically remove toner on an object; a memory; a voltage applicator to apply a voltage to the cleaning brush members based on setup voltage values stored in the memory; a current detector to detect the amounts of currents flowing through contact portions of the object with the cleaning brush members; and a setup voltage changing device to change the setup voltage values based on the amounts of currents detected by the current detector. The voltage applicator applies a first voltage for removing residual toner or a second voltage higher than the first voltage in absolute value for removing non-transferred toner to at least one of the cleaning brush members, and the setup voltage changing device performs change of the setup voltage value for the second voltage prior to change of the setup voltage value for the first voltage.