Patent ID: 8741783

Claim:
A method of cleaning an inside of a processing chamber by supplying a cleaning gas into the processing chamber after performing a process of forming a thin film on a substrate in the processing chamber, the method comprising: supplying a fluorine-based gas and a nitrogen oxide-based gas or a fluorine-based gas and a nitrogen oxide-based gas diluted with an inert gas, as the cleaning gas, into the processing chamber heated to a first temperature, and removing a deposit, including the thin film deposited on a surface of a member in the processing chamber, by a thermochemical reaction; changing a temperature in the processing chamber to a second temperature higher than the first temperature; and supplying the fluorine-based gas and the nitrogen oxide-based gas or the fluorine-based gas and the nitrogen oxide-based gas diluted with the inert gas, as the cleaning gas, into the processing chamber heated to the second temperature, and removing extraneous materials, remaining on the surface of the member in the processing chamber after removing the deposit including the thin film by a thermochemical reaction, wherein a flow rate ratio of the nitrogen oxide-based gas to the fluorine-based gas is set to be a first flow rate ratio in the removing of the deposit including the thin film, a flow rate ratio of the nitrogen oxide-based gas to the fluorine-based gas is set to be a second flow rate ratio in the removing of the extraneous materials, and the second flow rate ratio is smaller than the first flow rate ratio.