Getting Car Plastic Black Again – Inside and Out

In most cases you can get faded plastic trim on your car black again in two steps: clean it thoroughly first, then refresh it with a suitable plastic care in the glossary product. The key is to use different products outside and inside – exterior plastic needs protection against the weather, while the interior needs a matt finish that doesn’t look greasy. Only when the material is already chalky, cracked or porous does care reach its limits; then dyeing or painting is the more honest solution.

Why car plastic turns grey

Unpainted parts such as bumpers, sill trims, mirror bases or scuttle panels are made of through-coloured plastic. From the factory it looks deep black because the surface is closed and still contains plasticisers and conditioning agents. Over time, two things wear it down:

• UV radiation: sunlight bleaches the surface. The plastic becomes lighter and dull, turning grey first where it gets the most sun – on top of the bumper, along the windscreen, on the dashboard.
• Washing out: rain, automatic car washes and harsh cleaners gradually remove the components that keep the plastic supple and dark. The surface dries out and becomes rough.

Inside the car it is mainly sunlight through the glass, plus skin oils, dust and frequent wiping with unsuitable products. You can find more on the term in the glossary under plastic care.

Before refreshing: clean thoroughly

The most common mistake is applying the care product to dirty plastic. The product then binds the dust, the result becomes blotchy and grey edges remain in the grain. So the rule applies inside and out: clean first, then dry, then treat.

Outside, the plastic parts are simply part of your normal wash. How to go about it is explained in our car wash guide. On heavily textured trims a soft brush helps to lift dirt out of the recesses. Old wax residue from the car wash often shows as whitish marks along the edges – remove it before refreshing, too.

Inside, use a cleaner that doesn’t leave a film. GLOSSDOC INTERIOR CLEAN & FRESH Interior Care removes dust, grease and dirt from plastics, dashboards and trim panels without residue or shine. Don’t spray it directly onto switches and displays; spray it onto a cloth instead. The GLOSSDOC Blue Interieur Microfibre Cloth is ideal for this and can be used dry or slightly damp depending on the dirt. The glossary explains why microfibre is gentler than a cotton rag.

Outside: refreshing bumpers, trims and mirror bases

Exterior plastics need a product that can stand up to rain and sun. GLOSSDOC EVER BLACK Magic-Deep is made for tyres and exterior plastics: it refreshes faded surfaces, gives an even, deep black finish and protects against drying out, cracking and environmental influences.

Here’s how to do it:

1. Wash the plastic and let it dry completely.
2. If needed, mask the adjacent paintwork with masking tape, especially on narrow trims.
3. Apply a small amount of the product to an applicator or a clean cloth, not directly onto the part.
4. Work it in evenly in small sections so that no edges form.
5. Remove any excess with a dry cloth so that nothing runs onto the paint.

For working and drying times, follow the instructions on the label. According to the product page, the refreshed look stays visible for several weeks with normal use, depending on the weather and how the car is used. After that, simply reapply. On tyres, treat only the sidewall, not the tread. You’ll find suitable exterior products under wheels & tyres.

Inside: matt, not greasy

In the interior the goal is different. Dashboard and door panels should look rich and even, but not shiny. Shiny plastic just below the windscreen reflects in the glass in sunshine and impairs your view. An oily film also feels unpleasant and attracts dust.

That’s why the same product shouldn’t go on the plastic inside and out. According to the product page, EVER BLACK is primarily designed for exterior plastics; for the interior we recommend a dedicated product. GLOSSDOC BLACK INTERIEUR DEEP MAGIC is developed for matt plastic and vinyl surfaces in the interior. It refreshes faded surfaces, leaves a deep black, satin-matt finish without greasy residue and protects against UV radiation and drying out.

Application is similar to the exterior: clean the surface, let it dry, apply the product thinly with a cloth, spread it evenly and remove the excess. Two thin coats are better than one heavy one – too much product is the main reason for blotchy or smeary results. Leave out anything that needs to stay grippy: steering wheel, pedals, gear lever and handles. According to the product page, the look lasts for several weeks with normal use; the product is intended for regular care. You’ll find more products in the interior category.

Home remedies: what to make of them

When you search for how to get car plastic black again, you quickly come across home remedies. A brief overview:

• Baby oil, olive oil, udder balm: the plastic turns darker for a short time because the oil wets the surface. The effect doesn’t last, though; outside, the next rain washes it off. Inside, a smeary film remains that binds dust and shines. Unsuitable.
• Washing-up liquid or all-purpose cleaner: sometimes usable for cleaning, but often too harsh. They can accelerate exactly the washing out that turns plastic grey.
• Heat gun: heat can briefly bring colour back to the surface of some plastics. The risk is high – deformation, glossy patches and damage to adjacent paintwork cannot be undone. We advise against it.

All in all, home remedies hardly save you any money, but you risk stains, smeary films or permanent damage.

Limits of care: when dyeing is the better option

Care refreshes what is still there. It doesn’t replace material. If the plastic is only slightly faded, it will look deep black again afterwards. With heavily weathered plastic it’s a different story. Typical signs:

• The surface is chalky; when you wipe over it, grey residue stays on the cloth.
• Fine cracks or a porous, rough texture are visible.
• After refreshing, the part turns grey again after a short time, even though you cleaned it thoroughly beforehand.

In that case, dyeing – plastic paint or paint with a suitable adhesion promoter – is the longer-lasting solution. That is no longer care, though, but a repair: the part has to be keyed, degreased and, depending on the material, primed. On matt original parts the gloss level should match the rest of the vehicle. For visible parts such as bumpers, a specialist workshop or replacing the part is often worthwhile.

While you’re refreshing things, it’s also worth looking at the windows: how to protect glass with a beading in the glossary effect is covered in our article on glass sealant for your car.

Frequently asked questions

Can I use the same product inside and outside?

Better not. Outside, plastic needs weather-resistant care; inside, a matt finish without shine. EVER BLACK is primarily designed for exterior use; inside, use a dedicated product such as BLACK INTERIEUR DEEP MAGIC.

How do I get interior plastic matt instead of shiny?

Clean thoroughly, use a product with a satin-matt finish and apply it thinly. Always remove the excess with a dry cloth – leftover product is usually the cause of a greasy shine.

How often do I need to refresh the plastic?

That depends on sun, weather and use. According to the product pages, the look stays visible for several weeks with normal use. When the plastic starts to look lighter again, reapply.

What should I use to clean the interior before treating it?

An interior cleaner that doesn’t leave a film and a clean microfibre cloth. Clean switches, displays and air vents via the cloth rather than spraying them directly.