A car interior cleaning kit only works if you use it in the right order. The biggest reason a DIY interior detail looks worse than it started — streaky glass, sealed-in grime on leather, soggy carpet that takes two days to dry — isn't bad products. It's wrong order. This kit is the gear plus the sequence, and the sequence is the differentiator.
Here is the order, and the reasoning is mechanical, not preference. **Vacuum first**, before you wet anything — once carpet fibers and seat seams have water in them, the dust you didn't pull out turns into mud you grind deeper. **Hard plastics with all-purpose cleaner next**, before you touch the fabric — APC overspray on cloth seats is fine when the fabric cleaner comes after and pulls it back out, but ruinous if the fabric is already wet and "done." **Then fabric and upholstery**, while the seats are still bare and you have clean towels. **Then leather** — clean it, dry it, and only then condition. Condition a dirty seat and you've laminated the dirt under the conditioner; that's the streaky-haze look people blame on the bottle. **Glass goes last**, every single time, because everything before it throws overspray, and glass is the only surface where overspray is visible at every angle. Right gear, right order, one cart.
