If I full restore my computer: will it clear up Flash Storage?

Storage usage for SSD is different than for traditional HDD, see:Mac notebooks: Mac OS X and Solid State Drive manufacturers report drive capacity differently and http://support.apple.com/kb/TS2419 for information on how OS X uses and reports storage.

If you are trying to improve the performance of the SSD, also see an article in PCWorld:http://www.pcworld.com/article/2088341/how-to-restore-your-ssd-to-peak-performan ce.html

It's best to describe the problem in as much relevant detail as possible, rather than what you think is causing it or how you think it should be solved.