This is why regardless of situation, always stick extra on for first clean.
Lol, liking the new term for these cultural types.
I had one a couple of months back. A chap just moving into private house to rent on a street which i clean the majority of and know most of people on street. Hes with a dark african friend and as both are talking im not sure which one was actually going to live there. Normal price would be £12 and i said first clean is £20 then £12 every 4 wks. He said he needs to speak to his wife (but no rings on finger) first and so left him card and said to call when he knows what hes doing as im in area for next 4 days. Then he ask why higher for first clean and so told him i normally get requests to sign up but cancel after first clean and as i dont know you (no offence) i cant take that chance. Plus i was last person to clean these windows over a yr ago. They spend 5 mins or so trying to knock price down (whilst im still cleaning neighbours windows so im not loosing out on time). Ok sign us up for regular cleans i said great, but taken from today i dont know if you will cancel next month and so the first clean charge stands. They then say ok, if we get you next month do you knock off the extra £8 charged today from the next clean. I laughed and said NO, we are taking it from face value how it stands today!!!
After i finished the house i was on, he popped round to give go ahead to clean them. Which i did but i took payment upfront first!
Next day, well night i was in town with my mrs and friends in a club. Guess who should be going round in clubs selling tackie flashing lights n roses.........yep same guy trying to sell me a rose for wife for £5 saying i should as i ripped him off for windows....i laughed and said hes ripping us drunken fools off for some tackie flashing lights

Needless to say i havent been asked to clean them on a regular basis