https://blendermarket.com/products/grungit

Grungit is an addon that automatically and effortlessly adds wear and tear to your models with a single click. The result is fully controllable and can deliver anything from imperfections and light wear to heavy damage. Why Grungit?  Unlike other methods, Grungit has very little impact on performance and it’s fully compatible with EEVEE, but surely the most important benefit is the considerable amount of precious time it saves.  The main goal of Grungit is to assist you, not to dictate a specific style that might not suit your needs, and it doesn't impact your workflow. That makes it very versatile and can deliver all kinds of results : You can use it to add subtle surface imperfections to give your renders an additional layer of realism, or you can make a painted surface for a machine with a lot of grunge, scratches and dirt.