I had this problem and fixed it with some basic maintenance spray (Halfords’ version of WD40 I think). This is what you need to do:
1. Take the mirrors off:
To do this you just need to angle the mirror using the mirror controls as far out and down as possible and pop off the two tabs you can see with a small flathead (there’s two more underneath but it will come off after removing two):
2. Pull off the mirror, it should come off easily with a little tug:
3. Using a spray with a straw attachment or a long jet, spray liberally down the hole above the folding mechanism:
4. Push the mirror back on with a click and enjoy the new sound!
1. Take the mirrors off:
To do this you just need to angle the mirror using the mirror controls as far out and down as possible and pop off the two tabs you can see with a small flathead (there’s two more underneath but it will come off after removing two):
2. Pull off the mirror, it should come off easily with a little tug:
3. Using a spray with a straw attachment or a long jet, spray liberally down the hole above the folding mechanism:
4. Push the mirror back on with a click and enjoy the new sound!