Patent ID: 7803230

Claim:
A substrate cleaning method for cleaning a substrate by bringing a brush into contact with the substrate while rotating the same, and by spraying liquid droplets from a two-fluid nozzle onto the substrate, wherein the brush and the two-fluid nozzle are moved radially outward relative to a center of the substrate, while a cleaning position of the two-fluid nozzle is kept nearer to the center of the substrate than a cleaning position of the brush, the cleaning position of the brush and the cleaning position of the two-fluid nozzle are moved in directions opposite to each other, the cleaning position of the two-fluid nozzle is moved radially outward to a periphery of the substrate relative to the center of the substrate to areas where the brush has been in contact with the substrate, a moving speed of the cleaning position of the two-fluid nozzle relative to the substrate is higher than a moving speed of the cleaning position of the brush relative to the substrate, and a difference between a distance from the center of the substrate to the cleaning position of the brush and a distance from the center of the substrate to the cleaning position of the two-fluid nozzle becomes gradually smaller, as the cleaning position of the brush approaches the periphery of the substrate.