A plastic window sill needs to be maintained on a regular basis as it is prone to permanent stains and discolouration.
That's why poorly maintained plastic turns from white to yellow.
Particularly striking are the old window sills, which look as if they can no longer be cleaned.
However, there is a remedy that will help save plastic from yellowing even in the most hopeless cases.
If the window sill really looks like nothing will help it, then it is worth taking decisive measures. The proposed method cannot be used on a regular basis, as it will negatively affect the plastic.
But as an emergency measure it will be a very good solution.
You will need to protect your hands with gloves and your respiratory system with a mask. You can even use glasses if you have sensitive eyes.
Take about a liter of water and pour in three spoons of hydrogen peroxide. Then add a couple of spoons of cosmetic lightener, which is used for hair coloring.
We treat the window sill, wait a few minutes and wash off the composition. Even the oldest and most discolored plastic will look new.