Possibly a dumb question, I had my windshield replaced, I wasn't there when it was done but have noticed that the passenger-side wiper doesn't go all the way down when I switch them off, it stops about an inch too high. There's nothing in the way so I think the gear/motor is just slightly in the wrong position. I can't see an obvious way to adjust these, could anyone shed some light, otherwise the wipers work fine. Regards

Just take the wiper arm off the wiper motor stud and move it a few 'clicks' around the stud. The stud is grooved.

That's where the dumb question comes in, I can't see how to take them off!

On mine, there is a little tab on the side at the bottom of the wiper at the post. A fingernail (more often a small screwdriver) to pry the tab outward and hold, while lifting the arm straight up off the post. Sometimes they are a PITA, and you have to use a larger screwdriver to help pry upwards, or the open end of an open-ended wrench that's large enough to go around the post. Tapping the top sometimes helps break the dirt/goo that's cementing it on.

They are on a post that's grooved. You just need to remove and twist 1 or 2 grooves in the right direction.

While they are off, you can take the blades out, and hit them with a shot of spray paint to make them pretty again!