I want wipe mac clean and re-install discs up to mountain lion

Hi  My computer is really slow and I want to wipe it back to factory settings and clean it out.  It's a 2007 and I have snow leopard 10.6.8 now and have already ordered lion and mountain lion to upload once it's cleaned.  I only have the snow leopard disc and nothing before that.  Do I need a start up disc or cleaning disc or can I just clean it out and upload snow leopard first then lion and mountain lion? Thanks!

You can use the Mac OS X 10.6 DVD to erase the internal drive and install a fresh OS.
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