wow, found this lovely tips from this blog: http://naijatec..com/2012/01/how-to-fix-scratched-ps2-disk-with.html and i has fascinated because it really worked for me

Most PlayStation 2 games will pick up a scratch or two when they are played frequently or traded between fellow gamers. These scratches can cause the disk to skip during game play. In some cases, they can even render the disk unplayable. There are several commercial products that can be purchased to help fix the scratches, but you can try using a little toothpaste first to remedy the problem.

Step1
Fill your sink with warm water and add a little bit of dish detergent. One small squirt of detergent is all you need.


Step2
Dip the disk in the water and gently move it around. Be careful not to hit the sides of the sink with the disk. Repeat the process if any stubborn dirt remains.

Step3
Rinse the disk by holding it under warm, running water. Make sure all the dirt and soap is removed. Let the disk air dry with the label side down, or dry it gently with a soft cloth.

Step4
Put a small amount of white, "chalky" toothpaste on the disk and gently rub it in using a circular motion. You must use a white toothpaste; gel toothpastes won't work.

Step5
Leave the toothpaste on the disk for five minutes

Step6
Hold the disk under warm running water to remove all the toothpaste. Set the disk aside (again, label side down) and let it air dry. You can also dry the disk by wiping it gently with a soft cloth.

Note: You must clean the disc before polishing it with toothpaste; this prevents dirt from being rubbed into the disc. Dirt that is rubbed into the disc can cause more scratches.

What of ps3 disc?

For ps3 disk. Insert the disk into acid then wipe on ur face. After which u insert into the console

@aliyumd you hash ooh, @Joagbaje i think it should work on PS3, BUT i haven't tried it on PS3, but it worked perfectly fine on ps2.