I am about to have my windows replaced at my home. The openings are all block frame, which from what I understand generally means that the exterior trim of the window doesn't need to be disturbed.
A previous owner had aluminum siding installed on the house. Unfortunately, the installer did a rather poor job where the siding meets the trim. In areas, there's a rather large gap between them and, as a remedy, a large amount of caulk has been used to fill the space.
Since I'm having the windows replaced, now seems to be the appropriate time to also clean this up. One of the window salesmen that visited my house recommended it just being ripped out and recaulked more carefully with new trim. I've also heard of something called j-channel being used but I'm not sure whether this is just for vinyl siding. What's the most pragmatic way of dealing with this?
Below is an example. This particular example doesn't have too bad of a gap (from what I can tell) but it gives you an idea of the existing state.