1, ordinary dirty, use eraser can wipe.
2, if stained with grease: first to warm soapy water wipe, and then wipe with rubber can.
3, if stained with ballpoint oil: eraser can be wiped.
4, if spilled to beer, soda, coffee: First with warm water dry, and then wipe clean.
5, Sticky to chewing gum: first with ice to make it solidified and then take away.
6, get the cream: first dry cloth dry, and then with a little cleaning agent clean.