What is the most efficient way to clean my car's engine?

I have an Audi A4 and I want to make sure my engine is cleaned efficiently without causing any damage. What steps and products do you recommend for achieving this?

First, park your car on a level surface and let the engine cool down completely. Then, gather a degreaser, a soft-bristled brush, and a hose. Spray the engine down with the degreaser, let it sit for a few minutes, and then use the brush to loosen any stuck-on dirt or grime. Rinse the engine thoroughly with the hose and let it dry completely.

For a more thorough clean, you can remove the engine cover and other components to access hard-to-reach areas. Be sure to cover any sensitive electronics with plastic bags to protect them from water. Use a specialized engine cleaner and a parts washer brush to clean the engine, then rinse and dry everything before reassembling.

Another option is to take your Audi to a professional detailer, who will have the experience and tools to clean your engine safely and effectively. This may be a good idea for newer or high-performance vehicles, as DIY engine cleaning can be risky.