The Complete Guide to Cleaning Aluminum Suspension Parts

Aluminum suspension parts are popular in automotive performance and restoration because they offer strength without the weight of steel. Over time, however, these components can accumulate brake dust, road grime, and oxidation, making them look dull or even corroded. Cleaning them properly not only restores their appearance but also helps you inspect for cracks or wear. This guide covers practical methods to clean your aluminum suspension parts without damaging the metal or any protective coatings.

Why Clean Aluminum Suspension Parts

Aluminum naturally forms a thin oxide layer that protects it from further corrosion. But when dirt, salt, and moisture sit on the surface, that layer can break down, leading to pitting or white powdery spots. Regular cleaning removes abrasive contaminants, extends the life of the parts, and makes it easier to spot potential issues like stress cracks. Plus, clean suspension components look great on a show car or daily driver.

Safety Precautions

Before you start, take proper safety measures. Aluminum cleaning often involves chemicals that can irritate skin or eyes. Wear gloves and safety glasses. Work in a well-ventilated area, especially if you use solvents or acidic cleaners. Also, ensure the car is securely jacked and supported on jack stands. Never work under a car supported only by a jack.

Tools and Materials

To clean aluminum suspension parts effectively, gather the following:

• A pressure washer or garden hose with a spray nozzle
• A bucket of warm water
• Mild car shampoo or a dedicated aluminum cleaner (non-caustic)
• Soft-bristle brushes (tire brush, detailing brushes)
• Microfiber towels or a chamois
• Aluminum polish or metal polish (optional)
• Wax or sealant (optional)
• Clay bar or clay mitt (optional, for smooth finish)
• Brake cleaner (for heavy grease, use sparingly)

Avoid using steel wool or wire brushes; they will scratch aluminum badly. Also, stay away from harsh acids like muriatic acid or heavy-duty oven cleaners, as they can etch the metal.

Step-by-Step Cleaning Process

1. Rinse the Parts

Start by rinsing the suspension components with water. Use a pressure washer on a low setting or a garden hose. This removes loose dirt and prevents scratching during hand washing. Focus on crevices where grime hides.

2. Apply a Degreaser or Cleaner

If the parts have grease or oil (common near ball joints or bushings), spray a dedicated degreaser or a mild aluminum cleaner. Let it dwell for a few minutes, but don't let it dry. For general grime, a car shampoo works fine.

3. Scrub with Soft Brushes

Use a soft-bristle brush to agitate the cleaner. For large flat areas, a detailing brush with long bristles works. For tight spots like control arm pockets, use a smaller brush. Do not scrub aggressively; let the cleaner do the work. Rinse the brush often.

4. Rinse Thoroughly

Rinse off all the cleaner with water. Any residue left can cause spotting or dullness. For stubborn areas, repeat steps 2 and 3.

5. Dry Immediately

Aluminum dries quickly, but water spots can form. Use microfiber towels to dry the parts. If needed, use compressed air to blow water out of crevices and joints.

6. Remove Oxidation (If Present)

If the aluminum has white oxidation or light corrosion, use a dedicated aluminum polish. Apply a small amount to a microfiber pad and rub in a circular motion. For heavy oxidation, use an aluminum restorer (like a metal polish with mild abrasives). Follow product directions. Never use heavy rubbing compounds designed for paint; they may be too harsh.

7. Polish for Shine (Optional)

For a mirror-like finish, apply a high-quality aluminum polish. Use a clean microfiber pad and buff until the shine appears. This step is purely cosmetic; it doesn't protect the metal.

8. Apply a Protective Coating

To keep your suspension parts clean longer, apply a wax or sealant designed for metal. Some products specifically for aluminum wheels work well on suspension components. A thin layer helps repel dirt and makes future cleaning easier.

Addressing Stubborn Stains and Corrosion

Sometimes brake dust or road salt leaves deep stains that don't come off with normal washing. In that case:

• Brake dust: Use an acidic wheel cleaner specifically labeled safe for aluminum. Follow instructions exactly; overexposure can damage the metal. Rinse thoroughly.
• Oxidation pits: Light pitting can be smoothed with very fine (2000-grit) wet sandpaper used with water. This is advanced and should only be done on bare aluminum. Polish afterward.
• White powder (aluminum oxide): Wipe with a mixture of water and white vinegar (50/50). Rinse well. Vinegar is mild enough not to damage the metal but effective at dissolving oxide.

When to Seek Professional Help

If your suspension parts have deep pitting, uneven corrosion, or structural cracks, cleaning won't fix them. In such cases, consult a mechanic. Also, if the parts have specialty coatings like anodizing or powder coating, aggressive cleaning can strip them. For those parts, use only a pH-neutral soap and soft brush. If the coating is damaged, consider professional refinishing.

Final Recommendation

The best way to clean aluminum suspension parts is to be consistent and gentle. Regular washes with a pH-neutral soap and soft brushes prevent buildup. For light oxidation, a dedicated aluminum polish works wonders. Avoid harsh chemicals and abrasive tools that can ruin the metal or its coating. If you maintain a simple routine, your suspension will look great and last longer.

Remember: Always check for safety issues like loose bolts or cracks while cleaning. A clean part is easier to inspect, so consider combining cleaning with a pre-drive inspection. With the right approach, you can keep your aluminum suspension parts in top condition for years.