Stickers - call them a mess or a status symbol or both.
As an employee of a company with generous parking facilities and also a member of two clubs, I need to stick three of these in my windscreen. However, the club stickers pose a problem. Every two-three years, they change the sticker since some members change cars and never remove the stickers giving free parking for the next owner!
Recently, I renewed the sticker of the Swift and found that the old sticker is a pig to remove and I need to spend a good hour to work at it. Till then, it remains an unsightly mess from a razor attack. Another aspect was the scratch marks on the glass.
Having put film on the skoda windscreen, I will be damned if I plan to scratch it or let the adhesive damage the film. I looked at putting the sticker on the sunvisor but it was not effective.
And then it came to me, 10 years ago, I remember a singapore taxi driver sticking a polythene sheet in the windscreen to display the CBD congestion token.
Unwrapping Xmas cake and I shouted Eureka - clingfilm was the answer
Ingredients
Clean hands
Plastic sheet
A knife
Cling film
Scissors 
Cut a small piece of cling film, larger than the sticker and stretch it on plastic sheet.(A harder smooth surface is even better) Smoothen out wrinkles 
Remove sticker backing and stick to the cling film slowly. Ensure that no wrinkles remain
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Trim the sides leaving about 5 -10 mm of clingfilm around the sticker.
Peel clingfilm and sticker from plastic sheet. Keep clingfilm base taut. Transfer and sticker on your windscreen. Trim the clingfilm with a blade.
Admittedly, there will be rough bits of cling-film on the back of the sticker edges but the advantage is that the sticker can be removed at will, i.e infrequently used stickers can be kept in a clear plastic pocket and applied when required or if you need clear visibility on race day!!!! 
