To restore its pure whiteness.. Discover a way to renew white plastic parts

Follow up – Lujain Ismail:

Over time, white plastic pieces tend to yellow as a result of exposure to light and grease. So discover the tried-and-true way to rejuvenate your white plastic pieces.

• Dissolve a tablespoon of starch in a cup of water (start gradually and stop adding water when the mixture becomes thick). Put it on the fire in a pot to heat it up a little.
• Remove the mixture from the fire as soon as it becomes gelatinous. Pour it into a wide glass bowl.
• Add one cup to two cups of oxygenated water. Mix everything, then add 1/3 scoop of Vanish Liquid. The mixture should be like the glue used for wallpaper. Leave it for about 10 minutes.
• Don’t use any metallic objects, just use glass and plastic.
• Then use a brush to apply an adequate amount of the mixture to the pieces you wish to restore their whiteness.
• Expose these pieces to sunlight for a few hours.
• Clean the mixture later with plenty of clear water (never forget to put on gloves and glasses)