Cure for the windshield
A windshield has to endure a lot in the course of its existence: bird droppings, dust, fingerprints. Traces of paws from cats etc. Often many influences gather. Warm water and washing-up liquid often help better here than some specific cleaning agents!
So sun rays stay outside
This trick is already largely known and can be seen in many vehicles. However, this tip could be helpful for people who have not yet had children: dimming prevents a dazzling sun!