Whilst working at Sandal BMW valeting their cars, i came across a little trick from one of the guys!
If after any bird poo has being removed and left a permanent mark, use a hot air gun! This brings out any imprinted marks etched in the paint leaving a near perfect result.
The gun was set to low and gently moved across the mark back and forth. It genuinely comes right out of the paint, I couldn't believe it !!!!!
Just don't leave it in one spot too long or use on plastic panels as it may melt.
I wonder if a hair dryer would do the same job? Has anyone else come across this unusual method?