Is there a way of deleting old files when upgrading to Lion

So I'm finally thinking about switching over from 10.6.8 to 10.7.5. Normally, when I upgrade to a newer OS, it's usually when a newer OS than that comes out. ie. Mountain Lion is out, so Lion would have seen it's issues and has been updated as much as it can. Basically, 10.7.5 is the best Lion will ever get. Hence why I'm willing to upgrade. I'll admit, I'm lazy when it comes to having to reinstall everything, but because old OS extensions and kernels don't get deleted when you upgrade to newer OS, I usually install a clean OS, which means I have to reinstall all my apps. I'm wondering if there's a way for all older OS system files that are not necessary anymore, to be deleted upon upgrading. Or will Apple ever design an upgrade that will do so.

Eric Shawn2 wrote:
So I'm finally thinking about switching over from 10.6.8 to 10.7.5. Normally, when I upgrade to a newer OS, it's usually when a newer OS than that comes out. ie. Mountain Lion is out, so Lion would have seen it's issues and has been updated as much as it can. Basically, 10.7.5 is the best Lion will ever get. Hence why I'm willing to upgrade. I'll admit, I'm lazy when it comes to having to reinstall everything, but because old OS extensions and kernels don't get deleted when you upgrade to newer OS, I usually install a clean OS, which means I have to reinstall all my apps. I'm wondering if there's a way for all older OS system files that are not necessary anymore, to be deleted upon upgrading. Or will Apple ever design an upgrade that will do so.
Buy Lion, erase your disk and install.
Pete

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Is there a way of deleting old files when upgrading to Lion

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