Aporte original por: Andrew Guenther ,
You are right, it is important to make sure the LCD is clean. Anything that is stuck to it will be clearly visible when you reassemble. Use a microfiber cloth to clean off the LCD, canned air is useful too. You can find both of these at most hardware stores. It is also important to work in a clean, dust-free environment. Make sure you do all that and you should be fine. Good luck!