Step 5: Remove everyhting and clean the shelf
This is simple, just undo everything you have done. After that, clean the parts whit soft cloth and water. If there is some heavy stains give it some fine sand paper and clean it again. The parts HAS TO be clean from dust and stains, and if the surface of the shelf is glossy and you are going to paint it, sand paper it first to make sure the new paint sticks to the material.