You need to be careful of your words. Corruption indicates rottenness. This can not be undone.
Try to look at a rotten fruit, there is nothing to save. Some people have gone onto the wrong path -- such as Paul had.
However, when they are made aware of their mistake and their serious sin, they change their ways. This is not corruption, this is taking the wrong road. The wrong road may be very wrong, but so was Paul's road, and he did change once he was made aware of his sin.
Others can too if they haven't become corrupted. Corruption implies an exact knowledge of wrongdoing and a choice of still persisting in this for selfish reason. Such can not be saved.