I wouldn't bother with the VW stuff, I mostly use autoglym stuff but others might say Meguires or whatever. I can personally recommend the Autoglym cabriolet cleaner if its the one with the cleaner and the protector for around £20. The cleaner does bring it up a bit and the protector is brilliant, so much so that if you pour a cup of water on the roof it will form into droplets and roll off, just dont expect it to do that when it p1sses it down though !ÂÂÂ

Also, to keep all the crap off your roof get one of those clothes rollers from the supermarket and then brush it with one of those to get all your bits off it.
This is what I'd advise for you to get to start off with, all Autoglym -
Outside -
Ultra Deep Shine - this is a good polish and will bring the bodywork up like glassÂÂÂ

Window Polish
Cabriolet cleaner and protector
Inside -
Leather Cleaner
Leather protector

Also get a very good leather but not one of the Autoglym pretend ones as thet are sh1te.ÂÂÂ

P.S. Not used it myself but some on here always recommend this for the leather
www.liquidleather.com