Thank heavens for headphones

I have memories of working for a bank where we never saw any cleaning staff because they came in at night. Sadly this can’t be said for the office I work in now. We have a cleaning woman who cleans the offices once a week, while we are trying to work in them. She doesn’t ask if you mind stepping away from your desk for a minute so she can clean it, which would be a time to get some coffee, but simply starts cleaning around you. Perhaps it’s just me but I have trouble trying to concentrate on my work while someone is moving things around on my desk. I think that the worst thing about this is that she sings tunelessly while she cleans. For some reason the sound of this singing drives me nuts and I feel like shaking her and yelling SHUT UP!