Vacuuming out an interior can make or break a “clean” interior! What do I mean, well…
Instead of just gliding the vacuum around the interior of the car, use a boars hair brush that will allow you to get into the crevices, between the seats, and down in the hard to reach places that need some agitation. Sure you can buy a long skinny attachment for the vacuum, but that only works for the loose dust, not the stuff that has been sitting there for a while. Something like this brush works really well.
Also, don’t take the floormats out and put the on the ground outside the car unless you plan on vacuuming the dirt from the underside of the mat as well! In fact, what I do is vacuum the mat, then put it on the seat, then vacuum the floor and surrounding area, then put the mat back in its proper place and proceed to vacuum the seat. No new dirt place in the car!
As for the glass, I use meguiars glass cleaner at about 8:1 and a microfiber towel that is no longer used on paint. You can also use glass towels here.
I will first spray the cleaner on directly on the window and do the outside, flip the towel over and remove the streaks if there are any. Then I will open the door and do the inside of the window without adding anymore cleaner (unless needed obviously) with the side of the towel that is less damp. This makes streaking less likely. After I go around the car with this process, I’ll take a fresh microfiber towel (but not a new one because those will lint on the glass) and wipe the insides and outsides one more time for streak-free and cleaned glass!
Hope someone finds those processes useful!!!!