1- First be sure to get the scratch-removal process successfully, you need to tape all the holes and buttons for the camera, headphone jack and so on.
2- Sand the back of the phone slowly and carefully. The deep scratches need a 300-grit sandpaper, while the lighter scratches need 1500-grit paper. Buff the scratch until you remove the shine from the casing. You should keep sand direction from the top to the bottom of the iPhone 5.
3- Wet the lowest grain sandpaper you have with a small bit of water & gently sand over the area you have already sanded. This ought to smooth out the surface.
4- Wet-sand the back again going in the opposite direction with the next highest grit sandpaper you have. For example, in the event you wet-sanded first with a 320-grit paper going from left to right, use 500-grit paper next, moving in detection from top to bottom. Repeat this until you have used all the sandpaper.
5- Check the scratch. If you can still find it, then just repeat the process.
6- Polish the phone by applying 3M Rubbing Compound with a power drill. Polish the phone until the original shine returns.
Scratches on the Screen
7- Put a dab of baking soda toothpaste on a soft cloth. Baking soda toothpaste is gritty, so it ought to buff the scratch out.
8- Use the toothpaste to rub your iphone 5 screen gently in circular direction, concentrating on the scratches.
9- Let the toothpaste dry for a few time, and then lightly buff the scratched places with the soft cloth again. If the scratch is still there, try this process one more time.
If you want to prevent the water from damaging your iPhone 5, I am afraid you have to buy an water-proof iPhone 5 cases to help you. Because my method can only help your fix the screen surface scratches and back cover damages. I think the scratches have remind you to buy iPhone 5 case, iPhone 5 screen protector, Apple accessories, right? If you have realized this, then my last suggestion is that you ought to buy those stuffs at professional stores if you don't want to lose your iPhone 5.
Do you have trouble on iPhone 5 scratches? Don't worry any more. After reading this article, you can solve this problem easily.