The deck, trucks, and wheels are the three most important components of a skateboard; therefore, skaters when cleaning and maintaining their skateboard usually pay a lot of attention to these parts and ignore others that are important as well.
On the deck, there is a layer of grip tape that is used to provide the proper grip while skating so that skaters will not fall off their board while riding at high speed. The rough surface of the grip tape can cause several difficulties in cleaning. Therefore, I highly recommend skaters learn the proper way to clean the grip tape through the cleaning guide available at: http://dbqhbinhphuoc.gov.vn/news/Tiep-xuc-cu-tri/THE-SIMPLEST-SKATEBOARD-MAINTENANCE-GUIDE-12/