Once you have cleaned and sorted it, I use one of these,
https://www.mgocspares.co.uk/product/t610/waterproof-half-cover-universal?nodePath=1/3/977/1161/1162/2931
my car sits outside as an older more vulnerable model has the only garage in my possession
It works well, is easy to take on and off and folds into a small square zip up case it comes with.
On very wet days moisture will be captured on the inside of the rear screen, but my TF is my daily driver, so a quick wipe usually sorts it.
Most importantly, the wind has not yet blown it off, the elasticated straps are very good.

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