If you ask any car-painting experts, they would certainly recommend that you should wait at least for two weeks or fifteen days before washing your car once the painting job has been completed. This will help the paint to settle down properly and the scratches will become totally invisible. However, during this two-week period, it is okay for you to go in for a modest hand wash. You should not be generous with water and restrict the washing to just one buck of water with soap. It would be ideal to stay away from the dish soap. This should be good enough to remove dirt that may get stuck on the surfaces of the newly painted care. Always use a soft cloth and stay away from brushes or other such abrasive objects because it could scrape the new paint.