Final answer:
Electrolysis and metal cleaner are two tools that can be used to clean metal scales, old paints, and rust.
Step-by-step explanation:
One tool that is commonly used to clean metal scales, old paints, and rust is electrolysis. This process separates non-metallic particles from the metallic ones and is effective for cleaning a wide variety of metallic objects, including old coins and rusted cast iron. Another tool that can be used is a metal cleaner, which contains abrasives and surfactants to remove dirt and stains from stainless steel sinks, faucets, and silverware.This process separates non-metallic particles from the metallic ones and is effective for cleaning a wide variety of metallic objects, including old coins and rusted cast iron.