Introduction: When using the anti-gravity case on a variety of surfaces, over time it can pick up some lint and dust. How much depends on where you're sticking it. We've been testing additional cleaning methods to make sure the nano-suction surface of your case is always ready for action. Here are a couple options: · Quick Cleaning - Just take a damp cloth (or even a little water in your hand) and wipe down the back of the case. Give it 3-5mins to dry so all the moisture can evaporate from the nano-suction "craters" on the back of the case. · Faster Option - We've been trying new ways to clean the case quickly and this tip is by far the most effective. Simply take a lint roller, press it firmly on the case, peel it off and your case is like brand new. Specification: • Anti Gravity case Stick to glass, mirrors, whiteboards, metal, kitchen cabinets or tile, car GPS,and most smooth, flat surfaces. • Once Anti Gravity case back dirty with dust, use water to clean very clearly ,start to use again • Anti Gravity Case assemblyed by PC and TPU and import back stick material • Anti Gravity Case protect your phone very good customized case for iPhone. • Simple-press buttons allow you to feel the click and large openings for cable and charger ports . • Nanometre washable micro-suction back, Anti Gravity case Sticks without being sticky. • When the case back dirty with dust, you can clean it with water to recover it • Compatible with:iPhone 6/6S, iphone 7/7 plus; iPhone 6 Plus/6S Plus; • Material: PC+TPU • Protect your phone from scratch and shock. • Full access to all ports and buttons Note: 1. When the Anti Gravity case back dirty with dust, you can clean it with water to recover it 2. Please ensure that the case is firmly pressed down to the surface to create the seal. The surface must be smooth, walls are not smooth enough! There is a protective film on the back of the case this needs to be removed before the case will function.