Cleanly deleting data on a mac?

Soldato
Joined
18 Mar 2010
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4,174
My mother in law has sold her business, including a couple of iMacs in the office.
She has some personal files/ data on the iMacs that she would like to remove before handing them over. What's the best way of doing this.

Note - it will be a fairly small amount of date, and formatting the hd is not am option, as I am not sure we have backup media for the business software.
 
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