Patent ID: 8269946

Claim:
A lithographic apparatus comprising: a substrate table on which a substrate is held; a projection system including a final optical element, the projection system projecting a patterned beam of radiation through an immersion liquid onto the substrate adjacent the final optical element to expose the substrate during an immersion lithography process; and a liquid system including an inlet, the liquid system supplying the immersion liquid while the substrate is present below the inlet through a first channel without passing through a second channel during the immersion lithography process and supplying a cleaning liquid from the inlet while the substrate is not present below the inlet through the second channel without passing through the first channel during a cleanup process, wherein the cleanup process and the immersion lithography process are performed at different times, and wherein the substrate is moved below the inlet relative to the inlet during the immersion lithography process, and the substrate is not present below the inlet during the cleanup process.