If your black rubber has faded or discolored spots, you can rejuvenate it by using a special cleaning solution, such as Naphtha or Goof Off. Both can be purchased at most drugstores and are perfect for removing old, faded rubber and restoring its black color. However, some types of dirt can be too stubborn to remove with a cleaning solution, and you may need to use a stronger chemical to get rid of it. Thankfully, specific cleaners for rubber are available at most hardware stores.
Plastic trim restorers
There are several different plastic trim restorers on the market. Some of them are oil-based, while others are liquid-based. These products can be used on all types of trim, including black and grey plastic. However, be sure to choose one that protects your plastic trims and is not a dye.
One of the most important things to consider when restoring black plastic trim is the temperature. The temperature should be kept low because too hot can melt the plastic. To be sure, you should test the temperature of the heat gun before use. You should also work in small sections at a time so that the restoration is even. After a few minutes, the oil will rise to the surface and will bring back a rich black color.
While plastic restorers are effective, they’re not permanent. They tend to fade and degrade over time, especially in rainy environments. If you want a permanent solution, you can also apply a plastic sealant or protectant. This will slow down the process, but it won’t cure the problem. Another way to fix a faded plastic trim is to paint it. This is a great option for non-load-bearing trim, but you should be careful to clean the trim thoroughly first.
Peanut butter
If you want to rejuvenate black rubber on your vehicle, you can use peanut butter to restore the oil on the plastic surface. You can apply peanut butter like car polish, then wipe off with a clean cloth to remove the excess. The natural oil in peanut butter rehydrates the plastic and gives it a glossy shine. Moreover, it can also help remove sticky substances. Use a fresh terry cloth to wipe off the leftover peanut butter. 
The high fat content in peanut butter helps to restore the surface oils. In addition, boiled linseed oil is another popular solution. The plastic can be rubbed on with the oil and then allowed to dry. Afterwards, you can gently heat the plastic, which will draw out the oils and restore the colour.
Vinyl and rubber dressings
If you’re looking to restore the black rubber on your car, you should start by using a quality vinyl and rubber dressing. This product has several important benefits, including the ability to protect your car from UV rays and fade. It also seals and protects the finish.
Water-based vinyl and rubber dressings are ideal for both the interior and exterior of your vehicle. They’re usually white or creamy in color and are available in spray and cream form. They’re easy to apply and provide a like-new look to your plastic. They’re also suitable for interior surfaces, and their Advanced silicone components help protect against cracking and drying.
Forever Black
If you’d like to revitalize black rubber on your car, you can purchase a rubber trim dye. This product will restore the black color and offer a protective coating against the UV rays of the sun. The dye is easy to apply with a foam pad applicator tip. After applying the dye, let the bumper dry for about 20 minutes.
Black tint can also affect rubber seals on your car, which are typically located around the doors and windows. Over time, these seals can lose their ability to protect the interior of your car from wind and water. Fortunately, there are products available that can condition these parts, including a Zymol Seal.
