How to clean scratches off from 3GS?

Not sure about the back, but putting a screen protector on the front glass usually does a good job of hiding small scratches on the screen

The best, and most reliable method to remove scratches and subsequently polish plastic is to use liquid metal polish. Apply with a soft cloth and rub firmly until the imperfections have gone.

Before you do anything, make sure the scratches are actually scratches and not cracks. The back of the 3G and 3GS was particularly susceptible to cracking. Unfortunately here's nothing that can be done about this.

If you happen to know anyone with any kind of shop, there's a good chance that they have a buffing wheel. I've used it to polish up iPhones, and it works like a charm

MultiFinder17 said:

If you happen to know anyone with any kind of shop, there's a good chance that they have a buffing wheel. I've used it to polish up iPhones, and it works like a charm

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be careful if using a high rpm buffer. Very easy to burn thru plastic at high speed (high heat).