After lots of soap and hot water, it's a good first attempt - but if the paint is damaged you'll need a paint renovator - start with the finest one (AG Bodyshop 02b 2000 grit plus water is one, there are plenty of others!).
If you're parking in seagull territory it's worth giving the car a good clean and clay, then a really good waxing so any souvenirs wash off easily.
Good luck!