In order to reset it's performance back to new it should be secure erased. This is a SATA command, not the same thing as the old "secure erase" which overwrites the drive with random data several times. Usually the maker of the SSD has a utility to secure erase their drives.
If it's an OCZ, good luck. Their SSD utility, like their drives, is garbage and based on my experience can't even recognize their own drives.