**Scenario:** A question is asked where various different solutions could be classed as correct, and the OP accepts the one that they found useful at the time. 

Months later, a different solution is posted (one which ends up vastly outscoring the accepted answer). 

As the OP doesn't seem to use StackOverflow anymore, there is no way to ask them to unaccept the currently accepted answer and tick the superior one (note that the accepted answer isn't wrong per se, it just isn't as good/useful in comparison).

What is the standard procedure here? 

Unsure whether to:

* flag a mod to remove the answer as accepted/delete it if necessary
* edit it to include a link reference to the superior answer
* community wiki edit it to include a reference to all the different possible solutions
* or just leave it.

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**Edit:** Apologies, I am asking it from the perspective of when the accepted answer is your own.