Pro Window Cleaning was trying to be helpful. It’s my guess that he’s been around the block more than a couple times and his advice is worth listening too. Perhaps you could learn some valuable information about being a professional window cleaner if you lighten up a bit. 
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Have to agree with Pro Window Cleaning. Please learn (if not, master) the traditional methods before WFP. These two go together. Alone, they will lack certain pros. TOGETHER, they make you a very capable window cleaner.
But you know what, your business is your story. You write your own-- it is YOUR business after all. Good luck man, you have plenty to get going!
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Newb here, super helpful info. However, the guy in the video is using a scraper. I’ve heard mixed reviews on scraping? Yay or nay? And if not, do you do anything else between steps in order to ‘get the hard crusty stuff off’ so as to paraphrase his words? Thanks in advance! 
Yes. Scraping glass with a razor is risky business.
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