The best car detailing kits

Judge a kit on its contents list

This category is sold almost entirely on photographs of bottles and a piece count. Neither tells you anything: a fifteen-piece kit can be twelve microfiber cloths, and a piece count rises fastest by adding the cheapest items.

What separates kits is whether the maker publishes what is actually in the box. Chemical Guys publishes the Arsenal Builder as a foam cannon, bucket, grit guard, wash mitt, drying towels, a detailing brush, applicators and six 16 oz chemicals. That is checkable, and it is the basis on which this page ranks.

The second thing to read is bottle size. Sample-size chemicals make a kit look complete and run out during the second wash, which is how a kit that appeared cheap becomes a series of individual purchases. Sixteen ounces is a real working size.

The grit guard is the whole argument

If you take one thing from this page: the plastic grate in the bottom of the bucket is doing more to protect your paint than any chemical in the kit.

Swirl marks — the fine circular scratching visible in direct sun on dark paint — are not caused by dirt on the car. They are caused by dirt you have already removed from the car and then dragged back across it. Your mitt lifts grit, you rinse it in the bucket, the grit sits in suspension, you pick it back up and wipe it over the clear coat.

A grit guard sits above the bucket floor. Grit falls through and stays below it, and the mitt cannot reach it. It costs very little and it is the single highest-value item in a wash kit.

The foam cannon, and the thing it needs

A foam cannon attaches to a pressure washer and coats the car in thick soap that dwells on the surface. The point is not appearance — it is sequence.

Foam softens and lifts road film and grit so it can be rinsed away before anything physically touches the paint. Every particle removed by foam is a particle your mitt does not drag across the clear coat, which is the same logic as the grit guard applied one step earlier.

The catch is stated plainly: the cannon requires a pressure washer, which is not in the kit and typically costs more than the kit does. A hose-end foam gun is the alternative and produces noticeably thinner foam, because the pressure is not there to generate it.

If you do not own a pressure washer and are not buying one, a kit built around a foam cannon is a kit with an unusable centerpiece. Buy the bucket, grit guard, mitt, towels and chemicals and skip the cannon.

The order that actually protects paint

1. Wheels first, with separate tools. Brake dust is the most abrasive material on the car. A mitt used on wheels then used on paint is sandpaper. Never share them
2. Rinse the whole car to remove loose grit before anything touches it
3. Foam and dwell, following the product's stated time. Do not let it dry
4. Rinse the foam off — most of the dirt leaves here, before the mitt
5. Wash top down, straight lines rather than circles, rinsing the mitt between panels. The lower body is dirtiest and comes last
6. Rinse and dry immediately with a dedicated drying towel. Air drying is what leaves water spots

Straight lines rather than circles matters for a small reason with a visible result: any scratching you do inflict is then linear and far less visible than a circular swirl, which catches light from every angle.

What a wash kit is not

Sixteen pieces sounds comprehensive and this is a wash kit. Three stages of detailing are absent from it, and knowing that stops you expecting results it cannot produce.

• Decontamination. A clay bar or mitt pulls out bonded contamination a wash leaves behind. If the paint still feels rough after washing, that is what is left
• Correction. Polishing removes a microscopic layer of clear coat to level out existing scratches. This is the stage that removes swirls rather than preventing them
• Protection. Wax or sealant. Without it, clean paint is unprotected paint, and this is what makes the next wash easier

For most people that is fine. Washing correctly and often does more for a car's appearance than an occasional correction, and correction is a skill with a real risk of burning through clear coat.

The other half of the car

Exterior and interior kits are different products and get bought interchangeably. An interior kit contains fabric and plastic cleaners and a protectant; it will not wash paint. An exterior kit contains soap and wheel cleaner; it should not go on your dashboard.

For the cabin, the published-contents argument applies identically — best car cleaning kits. For the dashboard specifically, choose matte over glossy: a shiny dash reflects into a raked windshield and puts a ghost image in your eyeline, best dashboard protectants.

And two exterior jobs a wash kit will not touch: a yellowed headlight lens needs abrasives and a UV coat, best headlight restoration kits, and a car stored outside wants a breathable cover fitted only ever over clean paint, best car covers.