Patent ID: 7314529

Claim:
A substrate cleaning method for cleaning a substrate held on a rotary base while rotating said substrate in a substantially horizontal plane, said method comprising steps of: discharging a first detergent liquid from a first discharge element onto said substrate and forming a liquid film on a prescribed region of said substrate; and moving a second discharge element for discharging a cleaning mist formed by mixing a second detergent liquid and pressurized gas with each other onto said prescribed region of said substrate provided with said liquid film thereon from said second discharge element by said first discharge element, wherein said first discharge element is movable to form said liquid film of said first detergent liquid on said prescribed region of said substrate, said second discharge element is movable so that a reaching point of said cleaning mist on said substrate passes through a rotation center of said substrate, and said first and second discharge elements are movable so that said first detergent liquid and said cleaning mist do not interfere with each other before reaching said substrate, and wherein discharge of said first detergent liquid and said cleaning mist is started while said first and second discharge elements are located at the vicinity of a peripheral edge portion of said substrate at a start of cleaning, and said first and second discharge elements are thereafter moved toward the rotation center of said substrate.