There are a few things you can do to clean dirt bike if it is not being used regularly. The first step is to remove all of the grease and oil from the bike. This will help to prevent it from getting dirty and causing problems down the road. Next, you will need to wash the bike in warm water and soap. Be sure to use a mild soap so that the dirtbike does not get too dirty. Once the bike is clean, you will need to dry it off with a cloth or paper towel. Finally, you will need to apply a sealant or paint protection on the frame and fork. This will help keep the dirtbike looking new for years to come.