Uses of different clean tools? And fastest download site?

I have Nero 6 installed and am planning to upgrade to Nero 7 - i was looking at the different clean tolls and wondered what the difference is.
There’s the general clean tool, but also a Nero 6 clean tool (also a nero 7 one) which one do you use and what is the difference? Also there is a NeroVision express clean tool - wouldn’t neroVision get ‘cleaned’ when you use a specific version clean tool or general clean tool? The same applies for the incd one and the driver clean tool - will the general and version clean tools not ‘clean’ out drivers and incd?

I sometimes see links to different Nero download and ftp sites is there a particular site that is fast to download Nero7 (just english) ?