How do you remove bloom from paintwork resulting from bird droppings?

I recall you recommended a product for removing bloom from paintwork resulting from bird droppings. Could you please remind me what that product is?

How can I get rid of a light scratch caused by some grit left on a sponge?

I have a light scratch mark on the bonnet of my car from some grit left on a sponge - it's not deep. Can you recommend something to polish it out?

What is the best product for repairing minor scratches on paintwork from road chippings?

What is the best product for repairing minor scratches on paintwork from road chippings? And is there any product for protecting the bodywork from being scratched in the first place?