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Stretch the cloth over the drain so it is blocked completely. This will prevent screws or other small parts from falling in while you work on the valve. As you remove screws or other parts from the shower, keep them in the same place to avoid losing them. The shower handle usually adheres to the wall by screws. Remove the screws holding the handle in place and lift it off of the handle stem. Set the handle and screws on a flat surface to keep them aside until you're ready to screw them back in later. After you have the screws out, you may need to wiggle or tap on the handle to get it to slide off the stem. The trim plate should be secured to the wall with two screws. Unscrew both sides and lift the trim plate from the wall. Set it and the screws aside, preferably near the shower handle, until you need to screw it back in later on.  After you take the handle and trim plate off, you can soak it in vinegar or CLR to remove any built up grime. This will make them look new again. Shower trim plates are usually known as Escutcheon trim plates, in case you need to ask a home repair professional about your specific model. In some cases, there may be a layer of caulk surrounding the trim plate's edges. If caulk is adhering your trim plate to the wall along with the screws, scrape it off with a utility knife and then lift the trim plate off of the wall. You can purchase caulk online or from most home improvement stores.
Cover the shower drain with a washcloth. Take the shower handle off. Unscrew the trim plate. Remove any caulk around the trim plate, if applicable.