Patent ID: 8308870

Claim:
A cleaning method to perform a cleaning treatment on a substrate in a state where the substrate is rotatably held by a holding device, a drain cup to receive a draining liquid shaken off from the substrate is disposed surrounding a circumferential periphery of the substrate held by the holding device, and a drain tube to discharge the draining liquid within the drain cup is provided in the drain cup, the method comprising: a cleaning step to clean the substrate by supplying a chemical liquid to the substrate during rotation of the substrate; a rinsing step, after the cleaning step, to perform a rinsing treatment of the substrate by supplying a rinsing liquid to the substrate during rotation of the substrate; a drying step, after the rinsing step, to perform a drying treatment of the substrate by supplying a drying solvent to the substrate during rotation of the substrate; and a cleaning step to clean the drain cup and the drain tube by supplying a cleaning liquid from a cleaning liquid supply device to the drain cup in a state where the cleaning liquid is not supplied to the substrate, at a time when the drying step is performed, wherein the cleaning liquid used to clean the drain cup and the drain tube is discharged to the drain cup from a bottom portion of the drain cup lower than the substrate, wherein the cleaning liquid has a different ingredient from the chemical liquid used at the cleaning step to clean the substrate, and wherein the cleaning liquid washes out the drying solvent used at the drying step, thereby reducing an amount of the drying solvent mixed with the chemical liquid in the cleaning step of a subsequent substrate.