Wax = no matter how many coats will not protect against the horrid bird stuff (especially if they eat berries) for long = since the acids will eat through the wax and into the paint! Time is of the essence in this unruly equation = carry some club soda along to remove the first site of the stuff = if need be: place your thumb over the opening and shake the bottle well for some forceful spray action to aid in initial removal, then spray some detailing spray (meguiars makes a good one) on the area and then wipe clean with a microfiber towel! If left with a stain = you will need to polish it out preferably with a porter cable 7424 polisher and a good polish! Read all about it here ... and good luck.

http://www.autopia-carcare.com/inf-pc7424.html