What's the most likely cause?

[chris clean]

Hi Guys, been doing WFP for almost a year now and have never had a complaint. Just text a monthly customer about tomorrow's clean and she replied she would leave gate open as usual but ' please can you make sure Windows are done properly cos last time a few weren't done very well' I have apologised and said this time if any issues I need to know on day so i can come and see and rectify if needed.

I thinks she's genuinen its a huge house and very well off nice people ive been cleaning them for over 6 months. But not sure why I've never had an issue before and why only on a few of her house that has 20+ Windows? Any ideas or similar experiences? Cheers

 

[macca]

Check a few of the tops before u start tommorrow and also the cills just in case.

 

[chris clean]

Cheers macca, I always clean frames and sills but will check before I start

 

[johnny bravo]

just go back with ladders and if you can reach, have a look to see if anything there what shouldnt. spots etc