"Protectant" does not equal "magical force field" so keep that in mind.
Protectant - helps keep your windshield from getting little streaks on it.
Magical force field - keeps attacking space ships from opening fire on you.
Protectant - means you can see out of your windshield at night without lots of little sparkly irritants in front of your eyes.
Magical force field - reflects dragon fire back on the dragon in front of you
Protectant - means you can wash your windshield less.
Magical force field - means you can do whatever you want because who cares? It's magic!
KNOW THE DIFFERENCE BETWEEN PROTECTANT AND MAGICAL FORCE FIELDS! Only then can you make the right decision.