Meguiar's Ultimate Wash & Wax

No. Forum reviewers consistently document that the wax additive in this product deposits on ceramic-coated surfaces and interferes with the coating's hydrophobic performance. Multiple independent sources report that the wax residue diminishes the beading behavior that ceramic coatings are chosen for. For ceramic-coated vehicles, use a wax-free maintenance shampoo that will not deposit on the coating.

Yes — this is the most consistently documented community complaint. Multiple independent forum sources report wax buildup on the windshield after 3–4 washes, leading to night-driving haze and wiper streaking. Detailers who use this product regularly recommend masking the glass during use or cleaning the windshield with a dedicated glass cleaner after each wash.

The product label (confirmed on the back-of-bottle image) calls for 1 oz per gallon — a 1:128 working-solution ratio. This is the dilution used for all health and environment scoring on this page.

Yes. A California Prop 65 warning is confirmed on ASIN B01LW19HR4 (the same G17748 48 oz formula). The current ASIN (B00QYTJKM0) is out of stock and returned minimal data; the warning is based on the older in-stock ASIN for the same product. The specific listed substance is not identified in the SDS; the likely basis is trace 1,4-dioxane from the ethoxylated surfactant fraction, consistent with the pattern seen in other Meguiar's products.

Gold Class is the better all-purpose choice for most buyers. Both carry a California Prop 65 warning. Gold Class has a higher cleaning score — forum evidence does not document the same contamination-removal limitations seen with Ultimate Wash & Wax. Gold Class does not contain a wax additive, so it avoids the glass buildup problem and is broadly compatible with ceramic-coated vehicles. Ultimate Wash & Wax is a reasonable choice only for bare paint or lightly protected vehicles where a light wax boost is the goal and glass buildup is acceptable.

The SDS does not confirm biodegradability for the product mixture — SDS Section 12 defers all ecological data to the manufacturer without providing test results. No biodegradability credit is applied. The primary surfactant ingredients are anionic types commonly described as biodegradable in the scientific literature, but a manufacturer referral alone is not the SDS-confirmation basis required for the scoring credit.