my car sat outside for several of years before i got it and sits outside now as i live in a townhouse development surrounded by trees therefore bird shit is a constant annoyance. tried washing the car and really rubbing in but the stain is still there. the trunk is polka dotted with doo doo stains. i've seen people saying you can wet sand them off but this kinda frightens me as i think its just gonna scratch the paint off. i might have a polisher but its a big might. any help?