To be pardoned, dose not wipe the slate clean, but it brings an end to any and all legal action against a person or persons. But it dose not, totally wipe the record clean, like it never happened!
President Nixon, was pardoned for any and all crimes he may have committed during his term in office! It did not remove guilt, it just stopped the legal system from going after him, in any wsy!
A pardon, may also restore some or all civil privileges, that convictions may have removed!
If one is in prison or jail, a pardon would release one!
But again it dose not wipe the record clean!