Cleaning SMS

How does one remove machines from SMS?  I assume SMS can't do it automatically because the machine could be turned off.

If I had a list of dead machines could I run a delete query on the table that contains machines and would SMS then delete all the related data?
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For this there are available Maintenance Tasks
- Delete Aged Discovery Data
- Delete Inactive Client Discovery Data

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IBMJunkmanAuthor Commented:
Thanks.  Looks like these tasks don't run at my site.  I still have data from 2 years ago.
Are they enabled? If the systems are in AD they will be discovered again...
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