Mercedes-Benz: How to Clean Engine Bay

While a dirty engine bay won't damage your Mercedes-Benz C-Class, it's helpful to clean off that buildup grime every once in a while. All of the important components are covered, making it safer to use a bit of water to clean under the hood. This simple DIY project can also save a lot of money.

By Kate Halse - May 11, 2015
Contributors: bhamg

This article applies to the Mercedes-Benz C-Class w204/w205 (2007-Present), and E-Class w211/212 (2002-Present).

Whether you're ready for a deep cleaning or just want to touch up the engine bay, it's important to know how to successfully complete the task. Many owners prefer to use a typical garden hose, or even a wet towel rather than a high pressure sprayer. Unlike the exterior, you don't have to wash the engine bay as often. A general rule is to wash it every six months, or sooner if you live in a particularly harsh environment.

Materials Needed

  • Car wash soap
  • High-quality car wash
  • Spray bottle
  • Garden hose
  • Microfiber cloth (optional)

Step 1 – Make your own engine wash

A DIY engine wash is very simple to do, and it is quite effective when it comes to removing built up grime as well as dirt. To make your own product, combine 2.5 tablespoons of car wash soap along with 1 tablespoon of high-quality car wash (such as Armor All) into a spray bottle. Then, fill the bottle with water.

Figure 1. Add the engine wash mixture, and water into the bottle.

Step 2 – Wash the engine bay

Start by hosing down the engine bay. A low water pressure setting is optimal for getting rid of dust, dirt, and grime, while keeping water out of the various components as well as electronics under the hood. Once you're done spraying, apply a liberal amount of your homemade DIY car wash.

Figure 2. Hose down the engine bay.

Step 3 – Rinse off and dry engine bay

After letting the car wash mixture sit for a few minutes, rinse it off using a low water pressure setting on your garden hose. The next step is to dry off the engine bay. Some Mercedes-Benz owners start with a dry microfiber cloth. However, others simply turn the car on to drive it around the block. The heat from the engine will quickly dry any lingering wet spots.

Figure 3. Dry off the engine bay.

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