How easily I bleach sills from stains and yellowing

Plastic windowsills look great snow-white in a new form. But those who grow flowers on the windowsill and other plants, especially seedlings are often left traces not only on the pot, but also on the greens. If time does not notice the seats, then later to wash conventional cleaning-washing is not possible.
Previously, after the removal of seedlings always worried for window sills and even pokleit over a white film to divorce were not visible. One spring with seedlings is enough to damage the entire white surface of the sill. The first spring after replacement worktop I tried cleaned with hydrogen peroxide and baking soda, toothpaste and other life hacking enjoyed. But traces still remain.
What do I do now in such advanced cases. Receive laundry detergent, albeit expensive, but with bleaching effect (1 part), soda ash (0.5 parts) and adding boiling water as much as needed to form a slurry and whip. Preparing the mixture directly before application of the cleaned plastic. Nanoshu, rub well and leave about half an hour. If, after washing there are still some traces, then dipped Dimexidum (liquid from a pharmacy) a good place to soak stains and rub again and leave, but for 5-10 minutes. After Dimexidum should be carefully rinse several times with hot water and thought. But absolutely no spots are left. I unstick the old film and underneath even cleared the old yellowed spots on plants and pots. Try, how truly effective.

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