If you have desktop or an external USB drive enclosure, you can use Intel's Toolbox to wipe your SSD. However, if you are just reinstalling windows and using the drive yourself (AKA, you're not selling it) then just reinstall. No NEED to wipe unless you have proven a need to do so.
As for SSD's degrading as they get full, it's becoming more argumentative and theoretical rather than realistic. Realistically as drives fill up people, especially those that visit this site usually free it up quick. HDDs degrade if the data is toward the end of the drive and this can happen without filling up the drive. Both access time and transfer rates drop as the data closer to the end of the drive. It's almost always half the performance.