Another very effective method, not only for these objects, but also for household appliances, worktops, doors and furniture, is to use hydrogen peroxide. Again, it should be applied pure and left to act for one hour. At the end of the installation, it is sufficient to rinse thoroughly and dry well. Very simple, right?
But let us come to the real asset in the sleeve of any housewife who intends to renew the yellow plastic: toothpaste. While this may sound unthinkable, it will make a difference, provided it uses the whitening version.
Use an old used toothbrush: not only is it easy to handle, but it can also reach places that would otherwise be difficult to reach. Spread some toothpaste, rub it over the entire surface, insisting if necessary. You have to do circular movements exactly as you do when you brush your teeth. Leave to act for about 20 minutes, then dry with a slightly damp soft cloth to remove the excess.
If a first layer is not enough, repeat the tip of a teaspoon of sodium bicarbonate. In this way, you will strengthen the whitening power of toothpaste. The slightly abrasive action of sodium bicarbonate will penetrate between the polymers and make your objects white as snow.