Which roller shutters with a closed window, only glazing?

We once had this in a rental (large fixed window with roller shutter), next to it the patio door. To be honest, we never thought about the fact that the inside of the roller shutters might need cleaning. I wouldn’t worry about it.

You’ll start worrying at the latest when the dirt has reached the inside surfaces. Because it looks really crappy on both dark and light roller shutters. ... and the dirt comes faster than you think.

I do not (yet) know how heat passes through modern triple glazing, but at the moment (70s attic with double glazing) I really cannot do without blinds in the summer. The difference in room temperature is enormous when shaded or not - especially when it comes to windows on the south side.