I am new at this. Purchased a Porter-Cable random orbit polisher. I need to polish out bird dropping that never went away on the hood. I am going to use something mild, Pinncale World remover. My question: If I just polish the one spot on the hood will thqt part look different than the rest of the hood. The car is only 1 month old. Would I have to do the entrire hood - something I definitely do not want to do - or can I just do a small small section?