The stereotypes that come to mind are:
Robin Askwith or Anthony Booth (Cherie Blair's dad!) from Confessions of a Window Cleaner. George "When I'm Cleaning Windows" Formby, Stan Ogden
or unemployable alcoholics in shell suits who appear in the summer for booze money.
Yes I know most of us, I think, are skilled, trained and certified in high access – ladders and machinery, chemicals - acids and ammo etc, wfp and earn a shed load more money than most of the - "Oh, you're a window cleaner..." types but are we still looked down on and associated with the outdated above examples?
The reason for this post is that I met my missus' aunt for the first time today. The look of disgust on her face when I told her I'm a winda cleana, I could've tw*ted the old bint - she used to work for council apparently - wow!