Abstract: The present invention discloses new chamber clean chemistries for low temperature, gas phase, in-situ removal of fluorine doped tin oxide (FTO) films. These new in-situ cleaning chemistries will enable solar glass and low-emissivity glass manufacturers to improve the quality of FTO films produced, as well as reduce costs associated manual cleaning of FTO deposition systems. The end result is increased production throughput and better quality FTO films. This is achieved by using gas phase, in-situ cleaning molecules, such as, but not limited to, HI, CH3I, and HBr, in the FTO deposition chamber to remove unwanted buildup of FTO from chamber walls and components. Significant revenue can be derived from this customer benefit through molecule and technology solution sales related to in-situ FTO TCO chamber cleaning.