The edge of an expired credit card, or any similar plastic item with a cut edge. The edges do degrade quickly, but the plastic is gentle on the underlying paint. Use it as a scraper. Finish off with T-cut if needed.
I once had to remove hundreds of wind blown spots of paint this way that had landed on the cars in a garage forecourt.
Edited By David Jupp on 02/04/2020 08:38:46