There are many ways to cleanse your crystals, here are a few:
Place a new crystal on a large quartz cluster for a few days.
Cleanse by sage
Light sage and have the smoke cover the crystal
Bury the crystal in your garden for 24-48 hours
Set your stone out before nightfall and plan to bring it in before 11 a.m. This will allow your stone to bathe in the light of the both moon and sun
Place the Crystal in salt water for 48 hours
**Attention - not all crystals are appropriate for immersion in water