Which removes wiper scratches better?

CeriGlass is the safer pick. CARPRO states it removes fine to medium wiper scratches and swirls without warping the glass, and it is designed for pad or machine use. The QENASHAING powder can cut scratches too, but you control the mix and pressure with no guidance.

Can I use the powder by hand?

Yes. Mix the 3.5-micron powder with water into a slurry and rub with a felt or rayon pad. Keep it wet and work small sections. Expect slower results than a machine with CeriGlass.

Is CeriGlass worth the extra?

If you are correcting a car windshield, yes. You get a ready-mixed polish, water reactivation, stated non-warping behavior and a coating prep step. For a fish tank or lampshade, the powder is enough.

Which is better for hard water spots?

CeriGlass. Reviewers report it clears badly etched water spots from shower and car glass with a DA polisher and rayon pads. The powder will work on light stains but needs more passes.

Do either include pads or a machine?

No. The QENASHAING jar includes powder and a spoon. CeriGlass is polish only, though a 150 mL kit option exists. You supply applicators, pads and a polisher.

Can I use them on headlights or plastic?

CeriGlass lists Plexiglas and headlights among its application areas. The QENASHAING listing covers glass only, so keep it off plastic lenses.

Cerium Oxide Glass Scratch Remover vs CARPRO CeriGlass Glass Polish

Buy the CARPRO CeriGlass if you are polishing a windshield by machine and want a proven, water-reactivatable cerium polish with a 150 mL kit option. Buy the QENASHAING cerium oxide powder if you want a plain 120 g jar of 3.5-micron powder to mix yourself and work by hand or pad. Neither listing shows a price, so compare store prices on this page before deciding.

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