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[Vew]

Well, if the bird droppings are truly stains, the easiest way is using a clay bar. If they are etched, which means the acid in the crap sat on there too long and left an impression, then they only way is to polish it out. Try something like Meguires ScratchX. If that doesn't work, you'll have to look into something with a bit more bite. Or, if your entire car needs it, you may consider polishing the whole thing to restore that black paint.

As far as spray waxes, most spray waxes are only meant as 'touch up.' What I mean by that is it's meant to extended the current wax on the car, not meant to be used alone. If you're looking to buy a wax at a store and not online, the easiest stuff I have used thus far is Meguires NXT Wax. It's a synthetic wax so it does not leave any nasty residue behind. It's also very thin and easy to remove.

Just a tip/reminder. DO NOT WASH YOUR CAR WITH DISHSOAP unless your goal is to remove the wax. Use a car wash shampoo. They do not strip the car of wax or the trim of UV protectants. They also contain conditioners and lubricants that help avoid scratching your paint when you wash your car.

autopia.org is a good resource. It's a forum dedicated to car care, cleaning, and detailing. I just recently restored my trim and it makes the car as a whole look a world of difference.