
Yes, you can use Purple Power Degreaser on certain parts of your car, but it is not a one-size-fits-all solution and requires careful handling. It's an effective and affordable heavy-duty cleaner for greasy engine bays, wheels, and undercarriages. However, because it is a strong alkaline cleaner, it can damage sensitive surfaces like clear coats, aluminum, and plastics if used improperly.
The key to safe use is dilution and thorough rinsing. For general engine degreasing, a 1:1 dilution with water is a common starting point. Always test it on a small, inconspicuous area first. After applying and agitating with a brush, you must rinse the area completely with water. Leaving any residue can lead to discoloration or corrosion.
Here’s a quick guide on where and how to use it safely:
| Surface/Area | Recommended? | Key Precaution | Dilution Ratio (Product:Water) |
|---|---|---|---|
| Engine Block & Metal Parts | Yes, excellent | Avoid electrical components; rinse thoroughly. | 1:1 to Full Strength |
| Wheels & Rims (painted) | Yes, with caution | Quick application, immediate rinse. | 4:1 or weaker |
| Tires & Wheel Wells | Yes, ideal | Safe for most rubber and plastics. | 1:1 |
| Painted Body Panels | Not Recommended | High risk of damaging clear coat. | Avoid |
| Aluminum Components | Not Recommended | Can cause etching and discoloration. | Avoid |
| Interior Plastics & Vinyl | Not Recommended | Can dry out and crack surfaces. | Avoid |
For painted surfaces or interior detailing, always opt for pH-balanced, automotive-specific cleaners. They are formulated to be tough on grime but safe for your car's finishes. Purple Power is a powerful tool, but it's best reserved for the toughest, most durable parts of your vehicle.

I use it on my truck's engine bay all the time. It cuts through the built-up grime like nothing else. Just spray it on, let it sit for a minute or two, and scrub with a stiff brush. The most important step is to rinse it off completely with a hose. I'm always careful to avoid spraying it on the painted fenders or any wiring. For the price, it's unbeatable for a weekend engine clean.

Be very cautious. I learned the hard way that it can stain aluminum if you leave it on too long. It's strong stuff. I'd only use it for heavy-duty on the engine itself or the underside of the car. For anything else, like cleaning the exterior or interior, I'd spend the extra few dollars on a cleaner made specifically for cars. It's just not worth the risk of damaging your paint or trim.

It works, but you have to dilute it. Straight out of the bottle, it's too potent for most car parts. I mix it about half and half with water in a spray bottle for cleaning my wheels and engine. It saves a lot of money compared to brand-name automotive degreasers. Just have your hose ready to go for a quick rinse. Don't let it dry on the surface.

Think of it as an industrial cleaner that you can use on your car, not a car cleaner. It's fantastic for dissolving caked-on oil and grease from metal surfaces. However, its chemical strength is its biggest drawback. Always wear gloves and eye protection. If you're cleaning the engine, cover the alternator and ignition components with plastic bags. Safety and a complete rinse are non-negotiable.


