Why should you never polish your car?
Quick answer: The rule isn't "never polish" -- it's "don't polish needlessly or with the wrong products." If the car already carries specialist protection like a ceramic coating, maintain the coating instead of polishing. Otherwise an occasional, correct polish is fine to lift wash marks and oxidation from modern clear coat, which doesn't need routine polishing.
We don't agree that you should never polish a car. You should never polish it with the wrong products, and if you have specialist protection in place you don't need to polish at all. Otherwise polishing is always an option, especially for the particular issues that paintwork correction can solve.
A better question is, 'Do I need to polish my car?' -- to which the answer is no, not if you keep it well protected. The "never polish" line is shorthand for a valid warning dressed up as a blanket rule.
Where the "never polish" myth comes from
It comes from older cars, which had a single colour coat prone to fading and oxidation. The surface would go dull and milky and needed regular polish to remove the dead paint. Modern cars have a clear coat -- like a varnish -- that protects the colour below and makes the paintwork far more hard-wearing. Because routine polishing isn't part of the modern care cycle, some people have twisted that into "never polish".
What modern clear coat still needs
A modern clear coat will still oxidise and still pick up wash marks. A modern car won't need regular polishing, but the paintwork benefits from one: even a hand-applied polish will lift dead paint and take the edge off the fine swirl marks you get from washing.
Light oxidation that dulls the shine, fine wash marks from sponges and poor-quality mitts, shallow swirl marks sitting in the clear coat, and bonded contamination loosened by claying all still benefit from an occasional polish.
When you genuinely should not polish
There are situations where reaching for the polish is the wrong move. In each case the car either doesn't need it or would be damaged by it.
Polishing a car that already carries a ceramic coating strips the sacrificial layer -- maintain the coating instead. Fresh paint inside the repaint waiting period, while solvents are still gassing off, should be left alone. Matte or satin finishes are permanently damaged by polish, which leaves gloss patches. Decals, vinyl wraps and paint protection film also shouldn't see a polisher.
The real risks of wrong-way polishing
The dangers that feed the myth are real but avoidable. They come from the wrong products or the wrong technique, not from polishing itself:
Using aggressive compounds too often thins the clear coat. Rotary polisher misuse leaves holograms -- rotational marks in the finish. A pad left on one spot generates heat and burns the paint. Poor pad choice and speed combinations produce buffer trails.
Ceramic-coated cars: maintain, don't polish
If your car has a ceramic coating, polishing it defeats the point -- the compound abrades through the coating you paid for. Instead, keep up a proper wash routine, refresh with a topper and let the coating do its job. If the underlying paint genuinely needs correction, the coating has to come off first and be re-applied afterwards.
Polish as a tool, not a routine
Used sparingly and correctly, polish is one of the most useful tools in detailing. It's how we remove oxidation, lift wash marks and restore depth to tired paintwork. The modern approach is to polish when the paint calls for it, protect afterwards, then leave the paint alone until protection breaks down again.
Polish to correct -- not to clean. Protect after polishing with a sealant, wax or coating. Wash correctly so you don't undo the work. Re-polish only when defects return, not on a calendar.
Hand or machine?
A careful hand polish is virtually risk-free on modern clear coat and can still remove light oxidation and haze. A dual action polisher in sensible hands adds correction power without the heat risk of a rotary. The "never polish" advice is really aimed at people grabbing an unfamiliar machine and an aggressive compound without knowing what they're doing. There is a companion piece -- why should you never wax your car again? -- that follows the same logic for wax.