To Start with, Ensure that you’ve taken off all of the grit from the stones. Grit could potentially cause dullness, so you'll want to clean them completely with water and a mild soap. เครื่องเป่าใบไม้ ดูดใบไม้ ใช้น้ำมัน This can be reached by the constant friction in between the rock along with Successfully Submitted (Awaiting Approval)