Swirls marks in paint and on windscreen....

When it comes to consumer / amateur level paint correction by hand in removing swirls and microscratches I've found Meguiars Mirror Glaze #9 Swirl Remover 2.0 works well as a starting point, if thats not aggressive enough then try Meguiars ultimate compound which also dulls the paint a little so you need to follow up Meguiars Ultimate Polish then whatever wax or sealant you like eg Meguiars Ultimate Liquid Wax or Autoglym high definition wax. Meguiars Ultimate Liquid Wax is good because its easily applied and doesn't stain black plastic though I prefer the look of AG HD Wax on my Black Pearl Subaru.