Hi I have an Inspiron 1721 and just the other day I managed to flip a cup of a coffee over the keypad. There was no damage done as such but I have noticed some of the keys are sticking due to the sugar in the coffee. How do I remove keypad for to clean it. Also could anyone please tell me what to use for cleaning the screen as it is a type of plastic and I'm finding it quite difficult to clean... Thanks.