Used this company to clean my 40+ outside windows. Took the guy like 3+ hours to do it and it was well worth the money. I’ve lived in this house for almost a year and first time having windows professionally cleaned. I have never had birds fly into my windows until after window wolf cleaned them. I shit you not, in the 3 weeks since they were cleaned, 3(!!!) birds have slammed into my windows. They look like clean windows and the coincidence is quite the testament to their work.