For me they just wear off and stop working.
I also use pledge on all my glasses and goggles as a cleaner and anti-fog. Works excellently, I've done it for over 10 years now.
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Which sort of Pledge did you use. I found 4 different types, one of which I was a bit scared it "Wooden" work.
I always try to get the Bosch ones, Bosch spend a fortune on research and in turn produce a damn fine blade.
Lemon scented.:angel:
Like this:
Remove dust, dirt and common allergens - Pledge® Natural Beauty
Make sure you get stuff without walnut oil in it. The oil will just smear and make a huge mess.
then you can fry the spud in hot gear oil and eat it for tea !