Baby oil or linseed oil can also work as an alternative. [2] X Research source
To avoid getting olive oil on nearby objects, cover them with a tarp or towel.
If you can’t find another cloth, use the part of the first paper towel or wash cloth that isn’t oily.
For severe fading or discoloration, you may need to spray paint the plastic black.
You can buy car trim moisturizers at most automotive stores. Read its specific instructions carefully before applying the object. If you are trying to restore black plastic that isn’t part of your car, you can still try a moisturizer on your object.
How long this restoration method lasts depends on how often your car is exposed to direct sunlight. The more often you use you car, the quicker the restoration will fade. If you’ve used a heat gun in the past but the treatment no longer works, try adding olive oil to the plastic’s surface to restore its shine. You can buy or rent a heat gun online or from some hardware stores.
This method is primarily for car trims and bumpers. Do not use this method on black plastic attached to flammable materials (like some plastic toys).
Test the heat gun on an inconspicuous area first to make sure you like the treated plastic’s color.
If your plastic still looks faded or discolored, try applying olive oil or painting the object instead.
For a thorough cleaning or to remove stubborn dirt, immerse the object in water instead. [10] X Research source Dry the object off with a cloth before painting it.
If you don’t have a dry brush, a paint brush works as an alternative.
You can buy plastic primer online or from most craft stores. Thin primer coats are ideal because heavy or multiple coats can change the object’s texture.
Apply 3-4 coats to strengthen the paint’s color, waiting for it to dry in-between coats. Each coat should take about 30-60 minutes to dry—check the paint’s packaging for a specific time.
Paint primer is especially important if you will use your object outside, where it will be subject to the elements.
