Koch Chemie Green Star (GS) is a highly concentrated alkaline universal cleaner trusted by professional detailers and industrial cleaning operations worldwide. This phosphate-free, solvent-free formula delivers outstanding dirt and oil removal across a huge range of applications including engine bays, interior surfaces, workshop floors, exterior paintwork, wheels, and industrial equipment. VDA Class A compliant for use in automotive manufacturing and service environments.

Built-in corrosion inhibitors protect sensitive surfaces including anodized aluminum during cleaning, making it safe to use in engine bays and on precision components without risk of damage. Dilutes up to 1:3 for general cleaning or can be used at stronger concentrations for heavy industrial degreasing. One concentrate that replaces multiple different cleaning products across the shop.

If you are looking for the best professional all-purpose alkaline cleaner for automotive and industrial use, a Koch Chemie APC that handles engine cleaning, interior detailing, and exterior degreasing in one product, or a concentrated commercial cleaner with environmental credentials, Koch Chemie Green Star is a benchmark product in professional detailing chemistry. Available in 1L and 5L.

Koch Chemie Green Star Dilution & Usage

Green Star (GS) is Koch Chemie's flagship alkaline universal cleaner. One concentrate replaces several specialty cleaners across a detail shop — engine bays, interiors, wheels, shop floors, trim.

• Interior / light cleaning: 1:10 dilution (100ml concentrate + 900ml water)
• Engine bay: 1:5 dilution
• Heavy degreasing / wheel wells / shop floors: 1:3 dilution
• Straight: Extreme buildup only — always test first, always rinse thoroughly

pH: Alkaline. Not ceramic-coating-safe as a wash stage — use CES or GSF for coated vehicles. VDA Class A compliant, phosphate-free, solvent-free. Contains corrosion inhibitors — safe on anodized aluminum at proper dilution.

See the full Koch Chemie dilution chart for the complete KCX reference.

Frequently Asked Questions

Is Koch Chemie Green Star a degreaser?

Yes. Green Star is an alkaline APC that excels as a degreaser on engine bays, wheel wells, and industrial surfaces. At 1:3 to 1:5 dilution it cuts through grease, oil, and road grime. For lighter interior work use 1:10.

Is Koch Chemie Green Star safe on leather?

Not directly at wash dilutions. Green Star is alkaline and will strip leather oils over repeated use. For leather, use Koch Chemie Leather Star (LS) or Pol Star instead — both formulated specifically for interior leather and upholstery.

Is Koch Chemie Green Star pH neutral?

No. Green Star is alkaline — that's what makes it such an effective universal degreaser and APC. If you need a pH-neutral cleaner for ceramic-coated paint, use Koch Chemie Gentle Snow Foam (GSF) or Ceramic Effect Shampoo (CES).

Is Koch Chemie Green Star safe on ceramic coatings?

Not as a repeated wash stage. Green Star at wash dilution will slowly strip a ceramic coating because it's alkaline. For coated vehicles, use pH-neutral products (GSF, CES). Green Star is fine for engine bays, wheel wells, and uncoated exterior trim even on a coated car.

What's the best Koch Chemie Green Star dilution ratio?

For general interior and light cleaning, 1:10. For engine bays, 1:5. For heavy degreasing on floors, wheel wells, or industrial surfaces, 1:3. Always rinse thoroughly after use on exterior surfaces.

Buying for a shop? See our Koch Chemie wholesale program for B2B pricing on Koch Chemie Green Star (GS) and the full Koch Chemie lineup.