A friend of mine used to take his through a car wash with the roller brushes, I would never trust that though. I just use pressure washer everywhere apart from the roof and then use a hose on the roof and clean it with Autoglym roof cleaner.
If you care about keeping it in tip top shape, see videos from Meguiar's UK and/or Ammo NYC about the two-bucket method, how to wash and wipe the car from top to bottom (particularly in your case with a convertible), as well as third-party products that will really make it shine (claying/compounding/polishing and waxing it once every so often).
But for a normal maintenance wash, a classic jet wash with a two bucket method and a couple micro-fiber towels should be just fine. If you don't even have access to that, there are waterless solutions (which need many more towels though).
If you want to keep the vert top looking new longer do not wash the top every time you wash the car. I wash mine once every 4 or so washes and then only use a for cloth top cleaner (302 or the like) followed by a same manufacturer cloth top waterproofer. For the in between times when it is not washed just use a hand vacuum on the top to remove the dirt and grime. Warm water and a rag can be used to remove bird droppings and the like. The less you subject the top to harsh cleaners the longer it will retain its new car look. Note: follow the directions on the cloth top cleaner/waterproofer to the letter as the waterproofer will make a mess on exposed glass and paintwork.
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