dress it up however you want, but people are quick to see through any bull around what you call yourself.
If you try to make it sound better than it is, people will conclude you are slightly ashamed of what you do, which is worse than just saying "window cleaner" from the start.
If people turn their nose up, do a little dance.
It's only because most people think window cleaning is a lowly thing that they don't do it themselves...which means more money for us!
Yes I always rejoice when someone looks down their nose, it tells me my jobs safe. The day people start viewing window cleaning as some highly-paid, professional business, will be the day that it gets harder to find work.