Why should you cleanse your crystals? Just like anything, crystals hold energy and can get stagnant.
For you you can take a shower, dance it out, sit on the earth or go for an ocean swim. For crystals it is much the same. You want to refresh and re charge them with the following tools.
I like to use sage spray, sage smudging and selenite to cleanse my crystals. It's super easy and not hard to do. Simply spray the sage, light and smoke with the smudge stick or place your crystals in a selenite dish or besides selenite to cleanse them.