Bird Marks On Rolls Royce

Having cleaned the Lada yesterday it looked like a Rolls Royce, but with the spring well and truly here the birds that fly over have no respect for things like this. So I as make my way to the spotless car it is now no longer spotless as bird dropping have made their mark on the roof, bonnet and windows. It is worth cleaning each mark off as it happens? No, I will clean the car after another 9 months, which was the last time it got a wash. Perhaps I shouldn’t have cleaned washed it yesterday then I wouldn’t have noticed the marks this morning.