Selenite towers are an incredibly simple way to charge crystal jewelry. I suggest draping your bracelets over the tower overnight for a cleanse and charge so your crystals work for you at thier full potential.
 
Being one of the few crystals that have the power to cleanse themselves and other crystals besides people and places, you don't need to cleanse Selenite spiritually..Selenite is a calming stone that instils deep peace and is excellent for meditation or spiritual work. It assists judgement and insight. It clears confusion and aids in seeing the deeper picture.