I don't know how many because every tom, dick & harry own a HD special. I bid a job today the customer showed me recipts where he payed $85 dollars for a cleaning. One hood corigated 5ft wide, one fan, one vent, 4 filters very light grease latin cafe. He also stated PW was certified and did the job semi anually I did not see a hood sticker. Called me because the other guy is to busy now and customer has not recieved a return call from PW. It would take me 45min to an hour to do this job, but come on..... Another one is a fast food chineese joint quarterly for $350. These guys are taking money out of there own pockets. If you do a quality job and build repore your customer isn't going to shop price.