Short answer
Most replica Patek Philippe white gold watches are steel or tungsten with a rhodium or PVD coating, not solid 18k gold. Plating thickness runs 3 to 10 microns in most builds. Care means protecting that layer and the movement. Wipe the case with a microfiber cloth after each wear. Keep the watch away from chlorine, perfume, hair spray and abrasive polish. Store it at 40 to 60 percent relative humidity. Service the movement every 3 to 5 years.
Confirm the case metal
Read the spec sheet from the seller. Three builds are common: a 316L steel case with rhodium plating, a tungsten carbide case with a PVD layer, and a brass case with thicker gold plating. Each takes a different cloth and a different cleaning liquid. A magnet will not identify the metal. A jeweler with an X-ray fluorescence tester can, and the test costs little.
Clean the case and bracelet
Skin oil, sweat and sunscreen collect in the links and under the lugs. Mix one drop of mild dish soap in a cup of warm water. Dip a soft toothbrush, scrub the bracelet, rinse with clean water, then dry with a microfiber cloth. Skip this step on a leather strap. Keep water off the case unless the watch has a tested rating.
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Water resistance and gaskets
Case gaskets are the first part to fail. A printed 50m or 100m on the dial is a claim, not a test result. Do not swim or shower in the watch. Ask a watchmaker to pressure-test the case if you plan to wear it near water, and fit new gaskets at the same time. Rubber O-rings harden in 2 to 3 years.
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Protect the plating
Rhodium is hard but thin. Wear shows at contact points first: the clasp, the crown, the caseback edge, and the links next to the clasp. Chlorine, bleach and ammonia strip plating. So do polishing cloths loaded with rouge. Use those cloths on the crystal only. A jeweler can re-plate a case in rhodium. Cost runs $50 to $150 at US shops.
Movement and magnets
Movements in these watches are clones of the ETA 2824 or the Miyota 9015, both at 28,800 beats per hour. Oil breaks down with use. Service cost runs $80 to $200. Keep the watch 6 inches or more from speakers, tablets and magnetic clasps. A field above 100 gauss will slow a balance wheel.
Storage
Use a lined box with a soft interior. Set humidity at 40 to 60 percent. Keep the box out of direct sun. Wind an automatic movement 20 turns if it sits for more than a month. That keeps oil moving in the jewels.