Petoskey stones are small, smooth rocks that can be found in many places around the United States. They are often used as a form of currency and as a source of entertainment. To clean petoskey stones, you will need to first remove any dirt or debris that has built up on them. Then, you will need to use a soft cloth or a vacuum cleaner to remove all the dirt and debris that has built up on the petoskey stones. Finally, you will need to dry the petoskey stones by using a dryer or an oven.