Hermosa Engine Cleaner Guide

Use this guide with the product label and safety information. If the label differs from this page, the label takes precedence.

What you’re working towards

Engine-bay grime removed with controlled moisture and without forcing water into electrical components.

What you need

• Hermosa Engine Cleaner
• Waterproof gloves and eye protection
• Detail brush where required
• Microfibre towels
• Minimal fresh water only where safe and necessary

Engine-bay process

1. Switch off and cool completely. Never work on a running or hot engine.
2. Inspect and protect. Identify exposed electrical connections, intakes, damaged wiring and sensitive aftermarket components. Do not continue if you cannot protect them.
3. Apply locally. Spray cleaner onto selected components rather than flooding the bay.
4. Allow 1–2 minutes. Agitate stubborn grime lightly without letting product dry.
5. Wipe away. Use microfibre towels. Do not use a pressure washer or high-pressure hose in the engine bay.
6. Inspect and dry. Ensure residue and moisture are removed before starting the vehicle.

When to pause

Stop around exposed electrical parts, damaged insulation, open intakes, hot components or unknown aftermarket equipment. Seek professional help when the engine bay cannot be cleaned without water-ingress risk.

Check the surface before you start

Identify the material and the problem you want to treat. Previous coatings, repairs, damage, temperature and application technique can all affect the result. Test a hidden area if you are unsure how the surface will respond.

These directions bring together Hermosa’s product and application guidance and available safety information. They do not mean every material or technique has been laboratory tested. Follow the current product label, SDS and vehicle or material manufacturer’s instructions if they differ from this guide.

Work on a cool surface, out of direct sun, in sections small enough to control. If a first pass does not give the result you expected, check the surface and your method before adding more product, increasing the concentration, rubbing harder or leaving it on longer.

Before you put the tools away

• Inspect the whole treated area in good light, from more than one angle. Check for an even finish and remove residue, overspray and excess product.
• Check visibility and grip wherever the treated surface could affect driving. Resolve any issue before using the car.
• Keep tools for wheels, paint, glass and interiors separate. Clean them after use and discard contaminated consumables.
• Follow the drying, curing and washing restrictions on the label and in the steps above.
• For an unusual material, note what you used and how it responded. It will help next time.