996 Outdoor Cover

[jccs]

I have a 996 with an aero kit (rear spoiler) and I have no option but to park under a large tree which at this time of year seems to do nothing but cover my car with droplets of sap. I have to wash the car almost everyday (I have to set my alarm to get up early before I leave for work) as this stuff is like glue and using the wash/wipers never does much except smear it all over the windscreen to the point of me struggling to even see out. I have a indoor cover which is used during the winter when the car is garaged but this is an indoor cover and to be fair is a bit of a pain in the a**e to use every time I park on my drive.
What I am looking for is a small cover which can easily be attached over the front mirrors and the rear spoiler and simply cover the windows of the car. After searching the usual Fleabay & Amazon all I can find is the same universal covers which I purchased one from Argos (small size) and very quickly returned it as it almost covered the whole car.
Hopefully somebody has had the same sort of problem and can point me in the right direction so I can get a bit extra sleep on a morning and stop having to drive a pritt stick car.