Via Twitter @ Scott Hanselman:

>VSP1CLN.exe
This operation will make Windows Vista Service Pack 1 permanent on this computer.
Upon completion you will not be able to remove Windows Vista Service Pack 1 from this system.

Would you like to continue? (Y/N): y
Performing Windows Vista Service Pack 1 Disk Clean-up…
Windows Vista Service Pack 1 Disk Clean-up completed.

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