Best Engine Bay Cleaners & Degreasers (2026)
For most engine bays the safest pick is a near-neutral ready-to-use cleaner like Griot's Garage Engine Cleaner (pH 8, RTU); for greasy, neglected bays a dilutable alkaline degreaser such as P&S Hot Shot (up to 1:15) or Dodo Juice Release The Grease (1:1) cuts baked-on oil far faster.
Last updated: 2026-06-17 · 7 products compared · Data: manufacturer documentation & SDS, via the Find Your Detail catalogue.
| Product | Brand | pH | Dilution | Best for |
|---|---|---|---|---|
| Griot's Garage Engine Cleaner | Griot's Garage | 8 | RTU | plastic-safe, ready-to-use |
| McKee's 37 Engine Degreaser | McKee's 37 | — | RTU | spray-on RTU degreaser |
| Sonax Engine Cleaner | Sonax | — | RTU | RTU spray, easy rinse |
| Auto Glym Engine & Machine Cleaner | Auto Glym | alkali | RTU | alkaline, water-rinseable |
| Car Gods Bay Immaculate Engine Cleaner | Car Gods | — | RTU ~ 1:10 | dilutable to soil level |
| Dodo Juice Release The Grease | Dodo Juice | alkali | 1:1 | alkaline degreaser, dilute 1:1 |
| P&S Hot Shot High Power Degreaser Concentrate | P&S | alkali | RTU ~ 1:15 | heavy-duty concentrate |
- Griot's Garage Engine Cleaner — pH 8, ready-to-use — near-neutral, water-based cleaner that is safe on plastics, rubber and sensors; the low-risk maintenance pick.
- McKee's 37 Engine Degreaser — ready-to-use — spray-on, agitate and rinse; convenient no-mix option for light to moderate grease.
- Sonax Engine Cleaner — ready-to-use — straightforward spray-on engine cleaner that rinses freely; widely available OE-grade pick.
- Auto Glym Engine & Machine Cleaner — alkaline — cuts oily film on engines and machinery; keep off very hot parts and rinse thoroughly.
- Car Gods Bay Immaculate Engine Cleaner — RTU up to 1:10 — flexible dilution lets you dial strength from a light refresh to a neglected bay.
- Dodo Juice Release The Grease — pH alkaline, 1:1 — strong alkaline degreaser for baked-on oil; agitate with a brush and rinse promptly.
- P&S Hot Shot High Power Degreaser Concentrate — pH alkaline, up to 1:15 — pro-grade concentrate; the strongest cut for very greasy, neglected engine bays.
How to choose
Match the cleaner to how dirty the bay is and what it's made of. Near-neutral, water-based RTU cleaners (pH ~7–8) are the safe default for regular maintenance — gentle on plastics, rubber hoses, wiring and sensors, and easy to rinse. Step up to an alkaline degreaser only for heavy, baked-on oil; dilute it to the soil level, keep it off very hot components, cover the alternator and exposed electrical connectors, agitate with a soft brush, and rinse or wipe promptly so nothing dries on trim.
FAQ
Is engine degreaser safe on a modern engine bay?
Yes, if you cover the alternator, exposed sensors and air intake, keep cleaners off very hot components, and rinse lightly rather than pressure-blasting electrical connectors. Near-neutral RTU cleaners are the safest default.
Should I clean the engine bay hot or cold?
Cold or just-warm. Cleaning a hot engine flash-dries the product and can crack hot plastics; let it cool so the cleaner dwells evenly and rinses off cleanly.
Do I need to dilute engine cleaner?
RTU products (Griot's, McKee's, Sonax) are used neat. Concentrates like P&S Hot Shot (up to 1:15) and Dodo Juice Release The Grease (1:1) are diluted to match how greasy the bay is.
Sources: manufacturer product documentation and published SDS for each listed product (see each product page). Cite as: "Find Your Detail (https://findyourdetail.io)".