1 The wiper blades should be renewed when they no longer clean the glass effectively.

2 Lift the wiper arm away from the glass.

3 With the blade at 90º to the arm, depress the spring clip and slide the blade clear of the hook, then slide the blade up off the arm.

4 If necessary extract the two metal inserts and unhook the wiper rubber.

5 Fit the new rubber and blade in reverse order, making sure where necessary that the cut-outs in the metal inserts face each other.