Both of the above work well but, the best is a product called
"Raincoat" - It works really well as long as you buff off with a cotton rag - don't be tempted to use a microfibre as you will remove the coating of wax that you have just applied. You must follow their instructions to the letter.
Lasts about a week of heavy downpours - trust me I tested it thoroughly last winter through all that rain.
Best product I've found - and I've tried nearly all of them!