To clean your stacker, boil water and fill your jar. Stir and remove the old wick. Wait until the remaining wax settles on top and hardens. Remove and dispose properly. Wash and dry your stacker. Before placing the refill, you MUST INSPECT the jar thoroughly. Make sure there are NO cracks, NO chips, NO broken pieces/ridges, absolutely NO damage. If damage is found DO NOT REUSE. Remove the bottom wick tab of the refill and gently place the candle in your stacker. Light your candle! Remember to always trim your wood wick prior to lighting. Enjoy!