Rubbing alcohol is the best to use on most of your phone (buttons, speaker area, etc) for getting rid of germs and oils, however on some older models that have the plastic encasement over the display you will want to use glass cleaner on that particular part or else the plastic covering may turn opaque.

You may also want to occasionally clean the bottom where you connect the charger. For this, you can dip a soft bristled toothbrush in a bit of rubbing alcohol (do not immerse it) and gently brush the connection area to free up any goo or small particles that are wedged or blocking your connectors.

Never use any type of liquid behind the battery. Most phone manufacturers have a dot or line on the back behind the battery that – if gotten even remotely wet or damp – will leave a tell-tale mark. It won’t hurt your phone, but if you should have an issue while it is under warranty they will assume it is water damage and won’t even bother taking it apart to see otherwise.

Quick Tips:-

* Try to use a clean, lightweight cloth.
* Don’t use a rag that is frequently exposed to basic chemicals like bleach.
* Use a cloth that won’t leave behind little bits of fuzz or lint. IE: Makeup Facial Pad

Warnings:-

* It is highly recommended that you do not do this. Taking apart the phone voids the warranty. It is very easy to short circuit a cell phone. The chances of your phone ever working again are very slim.
* Don’t apply alcohol to the phone’s charging port or its interior unless you are using denatured alcohol. As well as possibly voiding your warranty, it could also wreck your phone.

- By Inderjit Singh