porous & non-porous black/grey trim. &lt;top&gt; When using Tech Wax (G12718) "less is best", there is no need to apply this product thickly. Always apply onto a cool, dry and clean paint surface. For cooler temperature regions or in high humidity areas, a longer dry time is required which allows the wax to set, avoiding smear marks occurring with wipe-off. If you have used too-much product, a longer flash time is needed to allow the wax to "set up" before wipe-off. We recommend using the Supreme Shine Microfibre Towel (X2010) for a faster, cleaner wipe-off. Meguiar's Ultimate Quik Detailer (G14422) used with our Supreme Shine Microfibre Towel (X2010) will safely remove any streaking without scratching and will restore the surface to a brilliant, deep shine. If this fails, reapply the original polish/wax product then quickly wipe-off residue. All Meguiar's car wash products are PH neutral, containing no detergent based chemicals that strip away the wax and are therefore safe to use with any of our polishes/waxes. However, it's best to wash your car with the wash that has been developed to suit the individual polish/wax. Remember that the wash has been chemically engineered to maximise the life & shine of the wax in the same family of products. For example Ultimate Liquid Wax (G18216) with Ultimate Wash & Wax (G17748), NXT Generation Tech Wax 2.0 (G12718) with NXT Generation Car Wash (G12619 or G12664) PlastX (G12310) is not suited and we do not recommend it for use on painted plastic