[proud American in Canada]

Just deleting them doesn’t get rid of them. They are still in the computer for quite awhile.

Huh.... that's interesting to know. :)

[dforest]

My son told me they go to some unused space and disappear when that space is refilled.

Something like that, I am no expert. A forensic computer expert could find it quickly. They are still on the hard drive somewhere.

[kevkrom]

Not only do they remain in the computer (findable through PC recovery methods), but in government and corporate environments, the servers maintain archives, too.