How to Clean Cloudy or Yellow Headlights, and Keep Them Clear
To clean cloudy or yellow headlights, wash the lens, check that the haze is on the outside, then sand the yellowed layer off with finer and finer grits, polish the lens clear and seal it with a UV clear coat. Soap or glass cleaner only lifts road film; skip the coat and bare plastic yellows again.
Dirty, oxidized or fogged inside: which kind of cloudy is it?
| What you see and feel | What it is | What cleans it |
|---|---|---|
| Dull film or bug spots that a damp finger wipes through | Road film on top of a healthy lens | Car shampoo and a microfiber cloth; nothing abrasive |
| Yellow or cloudy, rough or chalky to the touch | The factory coat failing in the sun; polycarbonate "is subject to deterioration when exposed to ultraviolet (UV) light" (AAA report) | Sand, polish and recoat: the steps below |
| Light fog inside that dries after the lamps have been on a while | Normal condensation (HELLA) | Nothing |
| Water drops on the inside, or water pooling in the bottom of the lamp | A damaged seal or a blocked ventilation opening, the two things HELLA says to check; if water still collects after that, "the light has to be replaced" (HELLA) | A shop, not a kit |
| Haze that stays while the outside feels smooth | Damage inside the lamp; 3M's kit "will not repair moisture, damage, or defects on the inside of the headlight lens" (3M) | A new headlamp |
| Cracks through the lens, or a glass lens | Structural damage; 3M's directions also say "do not use on glass or glass headlight lenses" (3M) | A new headlamp; a plastic-lens kit is not for glass |
Do the finger test in the shade with the lens dry. One more check before you sand: 3M's directions say that if the lenses "are 0-5 years old and do not have any yellowing or do not appear cloudy, do not proceed" (3M). Sanding removes coating, so a clear lens only needs a wash.
What you need to clean headlights properly
- A kit that ends in a UV clear coat, or a sanding kit plus a separate UV coat. Read the box: some kits end with a polish or wax only.
- Car shampoo, a bucket and two or three clean microfiber cloths.
- Painter's or automotive masking tape, two layers around each lens (3M).
- A spray bottle of water for wet sanding, and a towel to wipe up the slurry.
- A drill, if the kit calls for one: 3M's drill kit needs 1200 to 1600 rpm, because "a higher rpm drill could generate excessive heat and can cause damage to the headlight lens" (3M). Hand kits work without one.
- Gloves and safety glasses; 3M recommends protective eyewear and dust control when sanding (3M).
- Shade and a dry day, with time for the coat to cure before the car sees rain.
How to clean headlights, step by step
- 01
Wash the lens and the area around it
Car soap and warm water on the lens and the paint around it (AAA), so grit doesn't get dragged into the sanding. Dry it and do the finger test again.
- 02
Mask the paint and trim
Two layers of tape around the lens. 3M warns that "damage will occur if these surfaces are not protected", and says not to tape over chipped, peeling or repainted paint (3M).
- 03
Sand the yellow layer off
Start with the kit's coarsest grit: 3M's drill kit starts at P500, and the professional process in AAA's test used 320 grit to remove the factory film (3M, AAA report). Keep the disc or paper flat and moving. Stop only when the whole lens is an even, white, "frosted" haze; 3M: "If any portion of the lens looks clear or glossy, continue sanding." Clear or yellow patches are old coat, and a new coat over them fails with them.
- 04
Refine with finer grits
Each finer step replaces the last step's scratches with smaller ones. 3M goes from P500 to P800, then a P3000 foam disc used wet; AAA's professional process went 600, 1200, then 2000 (3M, AAA report). Wipe and look after each grit: if coarse scratches remain, keep going before you move up.
- 05
Polish the lens clear
A small amount of the kit's compound on a foam pad, held flat, until the cloudy haze is gone; 3M says not to run the foam pad dry (3M). If sanding marks still show, go back one grit. How sanding and polishing remove a damaged layer in general: the paint correction process.
- 06
Clean the lens back to bare plastic
Remove every trace of compound with the cleaner or wipe the coat's maker names. Delta Kits, which makes a professional lens coat, notes that most polishes contain wax, silicone or Teflon and that, if not thoroughly cleaned off, they have "sometimes compromised the chemical bond between the coating and the lens surface" (Delta Kits). Then let the lens dry completely: Delta Kits warns that water can leave the coating "cloudy or spotted after it dries".
- 07
Seal it with the UV coat, exactly as the label says
Shade, the label's temperature range (Delta Kits gives 50°F to 100°F for its coat) and the label's coats and cure time. Meguiar's Two Step kit, for one, asks for one medium wet coat, three to five minutes of drying, then a second coat, and says "the coating fully cures within 24 hours" (Meguiar's). Keep the lens dry and untouched until then.
- 08
Unmask, clean up and check the beams
Wipe the slurry up with a towel rather than hosing it into the street; LA's rules on runoff at home are in can I wash my car in my driveway. At night, shine the low beams on a wall: AAA says to make sure headlamps are "properly re-aimed" whichever fix you choose (AAA report). A shop does the aim.
What the kit makers' own instructions say
| Kit or process | How the yellow comes off | What goes on last | Maker's claim |
|---|---|---|---|
| 3M Headlight Lens Restoration System (39008) | Drill at 1200–1600 rpm: P500, P800, then P3000 wet, then rubbing compound (3M) | Nothing after the compound; 3M's "with Protectant" kit adds a wax that "will not prevent UV damage from occurring" (3M) | No durability claim in the directions |
| Meguiar's Two Step Headlight Restoration Kit | A cleaning solution on a pad, by hand, until the lens has "a uniform, frosted appearance" (Meguiar's) | Two coats of Meguiar's coating, cured within 24 hours | "Prevents re-oxidation for up to a year", lab tested per ASTM G154 (Meguiar's) |
| Cerakote Ceramic Headlight Restoration Kit | Oxidation-removing wipes, then two grits of sanding disc on a hand pad; "a simple, 30-minute solution" (Cerakote) | A ceramic clear-coat wipe | "Guaranteed to last as long as you own your vehicle, or we will refund/replace your purchase" (Cerakote) |
| The professional process in AAA's test | Power sanding that removed "all of the original protective film": 320, then 600, 1200 and 2000 grit (AAA report) | A protectant film cured hard with a UV light | "Claimed to last five years" (AAA report) |
Two things to take from the boxes. First, the last layer differs: a wax keeps dirt off but, in 3M's own words, does not stop UV, so the lens yellows again; a kit for lasting results ends in a UV or ceramic coat. Second, AAA found that most DIY kits tell you to remove "only the discolored surface" of the factory film (AAA report); sanding until the whole lens is evenly frosted, as above, takes all of it. A guarantee to refund the kit is not a lifespan: what each fix actually lasts is in how long does headlight restoration last.
How to keep headlights clear after cleaning
Even a good DIY job is "not a permanent solution": Consumer Reports found the haze typically becomes noticeable again after about a year (Consumer Reports). What slows it down is less sun on the lenses (a garage or covered spot), car shampoo rather than solvents, wax on the lenses when you wax the car (AAA), clear film over the restored lens, and a new coat at the first sign of dullness. The details are in how to make headlight restoration last longer, and why lenses yellow again is in why restored headlights turn yellow again.
Professional help
When to call a pro
Call a pro when the yellowing is deep or crazed, when a kit has already faded, when you would rather not sand next to your paint, or when you want a UV-cured hard coat instead of a wipe-on one. Headlight restoration checks first, at no charge, whether the haze is inside the lamp, then sands the old coat fully off, polishes the lens and puts a new UV coat on every time, wherever the car is parked.
More questions about cleaning headlights
Do toothpaste, WD-40 or bug spray clean cloudy headlights?
No. At best toothpaste rubs off a thin layer and WD-40 hides the haze, none of them puts UV protection back, and bug spray's DEET can damage plastic. Each remedy, with its sources: what removes oxidation and what hides it.
Can I clean headlights without a drill?
Can I use a headlight kit on taillights?
On plastic taillight lenses, yes. 3M's directions say "for taillight lenses, start at Step 10", the fine P3000 wet step, skipping the coarse sanding (3M). Mask the paint around them the same way.
Can cloudy headlights get you a ticket in California?
It can, if the haze stops the lamps working as the Vehicle Code requires; the Code sets no haze threshold itself. Required lighting must "at all times be maintained in good working order" (Vehicle Code 24252), and the low beam must reveal a person or vehicle at least 100 feet ahead, the high beam at least 350 feet (Vehicle Code 24407). The rules are summarized on cloudy headlights and California law. Not legal advice.
More in Paint Correction Explained
- Paint Correction Process: What It Is and How It Works, Step by StepWhat paint correction is, the steps, one-step vs two-step, the tools, and how much clear coat it removes.
- Does Paint Correction Remove Scratches? What It Can and Can't FixWhich scratches polishing removes, and what key marks, chips, dents, clear coat failure, oxidation and rust need instead.
- How to Remove Swirl Marks From a Car, With or Without a PolisherWhat causes swirl marks, the types, how to polish them out by machine or by hand, and how to keep them from coming back.
- How Long Does Paint Correction Take, and How Long Does It Last?How long correction takes and lasts, how many times paint can be corrected, polishing after body repair, and doing it yourself.
- Last updated September 15, 2026
MNG Mobile Car Detailing Beverly Hills
Your car, cared for where it is parked.
Choose the car, the service and a two-hour window. The card is saved at booking and charged after the job.
Not right? Tell us within 48 hours and we come back and fix it at no charge.
Calls 8 am–10 pm daily