The last two sets of Bosch wipers I've put on my car have squeaked - mainly at either end of the sweep (i.e. near the bottom and her the side of the screen). The left-most blade also leaves a mark on the screen in the area where it changes direction: if it's been raining, the water runs off the screen where the wipers sweep apart from in this area.
I'd like to adjust the blades but I'm not sure what the best way to do so is - I don't really want to break anything.
I'm thinking of trying some Valeo blades to see whether they are a bit better.