ok.. how many would be "multiple sessions"... i been doing it for an hour and still i got better but i see them,.... I can't feel them at all... dumb of me and i hate birds now!

The amount of time necessary depends on the scratch. You'll know when you're done.

As for bird droppings, they'll destroy your finish in no time. They are very acidic. I keep detailing spray in the trunk. My car gets a walk-around twice a day, as bird junk needs to be removed within 24 hours. Spray it until the detailing spray soaks it thouroughly. Allow it to soften and then wrap a micro fiber around your fingertips. Wipe from the outside in to the center, lifting up as you wipe inward. Once removed, spray and polish it out with a new cloth.