To be honest, I'm sitting in the dining room looking at the patio doors and they are not at all bad despite having not been cleaned for months. Certainly not enough to bother me.
Its always been a source of amazement to me that some people are so concerned about their windows because its not a big deal. Many of the houses I turn up to clean look pretty good before I start.
I remember last winter, right in the middle of the big freeze up going to a lady's house. As she opened the door and saw me she said "oh thank God you were able to get here, I've been so worried that you would be able to"
I mean really? She needs to get out more