A vibrator apparatus adapted for rubbing absorbent granules against a surface to remove oil spots therefrom. The apparatus comprises a platen (22) having a generally flat lower face (24) for engaging the surface, and a power driven shaft (26) rotatably mounted on the platen and eccentrically weighted for vibrating the platen to rub the granules against the surface. The eccentrically weighted shaft comprises at least two eccentric weights (30 and 32) mounted on the shaft and projecting radially therefrom at axially spaced locations. At least one of the eccentric weights is rotatable relative to the shaft to adjust the relative angular orientation of the eccentric weights and releasably lockable to the shaft, whereby adjustement of the relative angular orientations of the eccentric weights alters the vibrating motion of the platen. A method of removing oil spots with the vibrator apparatus is also disclosed.