New Cabrio
 

Hello all...I recently picked up my first Mini and it is also my first convertible. I love the car. It is awesome. But now I have a question. I was reading the owner's manual and it said that I need to treat the top with a waterproofing solution after every 4 to 5 car washings. This is a new one on me. What do you guys use? Is it really necessary to do this?