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Not exactly a
squeaky clean second chance, but historically, accounts with a certain degree of rank on the forum, and possibly the more reputed the better, have got to keep their account, but had to withstand a signature ban for a period of time, often within the one to two year range.
In addition, the actual act, the moment it was performed, and its recurrence will bear a saying in the final outcome. If it was a reiterative habit (perhaps even more than once), the chances will probably narrow down to that of a Quark.
This thread used to keep track of some appeals with such an outcome:
https://bitcointalk.org/index.php?topic=5144410.0Newer ranked accounts, and lower ranked accounts probably stand close to no chances, lacking a backlog of posts to counter on the balance as a net positive account for the forum.