The average salary for a window washer nationwide is $25,000. This varies from state to state and cities within the same state. Wages above the average are paid in New York, Boston and Chicago with salaries ranging from $28,000 to $31,000 while in California it is $29,000. In Washington, DC the salary is considerably higher than the average, where a window washer can make $34,000. Oklahoma is lower at $21,000.