Got new wiper blades a while ago(Valeo blades) and fitted them.
They were never great from the start(on the drivers side. passenger side was perfect) and now I've noticed that the drivers side one is making a lot of noise and leaving streaks and sometimes juddering.
Could I fix this myself or would I have to bring it to a mechanic?
Probably someone has washed the car with washing up liquid. This contains a small amount of silicon. Like hair shamppo it makes things squeeky clean! Try windscreen polish from Halfords. Might need several goes at it. Even then it may persist. It is hard to get rid off. And try Bosch blades next time from experiance these are good. They never judder or squeel on my cars.