Koch-Chemie (VB) Vorreiniger B | Precleaner B

Koch Chemie Vorreiniger B (VB) is a powerful alkaline pre-cleaner designed for heavy-duty exterior cleaning, pre-wash applications and commercial vehicle cleaning where strong dirt removal is required.

Features & Benefits

• Powerful alkaline pre-cleaner
• Designed for heavy dirt, traffic film and road grime
• Suitable for pre-wash and commercial cleaning applications
• Helps reduce contamination before contact washing
• Effective on lower panels, utility vehicles and heavily used vehicles
• Professional-grade cleaning strength
• Can be used through compatible pre-spray or foam equipment
• Ideal when mild shampoos are not strong enough

Koch Chemie Vorreiniger B is designed for vehicles and surfaces that need stronger cleaning than a standard maintenance shampoo or gentle snow foam can provide. It is a pre-cleaner suited to traffic film, heavy road grime, oily dirt and commercial vehicle contamination.

Pre-cleaning is an important step when a vehicle is heavily soiled. By chemically loosening contamination before contact washing, you reduce the amount of dirt left on the surface and lower the risk of scratching during the hand wash stage.

Vorreiniger B is best suited to harder-use vehicles, commercial fleets, lower panels, wheel arch areas and neglected exterior surfaces. It should be used with care on delicate finishes and existing protection, as stronger alkaline cleaners can reduce waxes or weaker protection layers if overused.

For regular maintenance washing, use Koch Chemie Gentle Snow Foam. For stronger but more versatile general cleaning, use Koch Chemie Green Star.

Pro Tip

Use Vorreiniger B as a targeted lower-panel cleaner rather than automatically applying it to the whole vehicle. Lower panels, rear bumpers and sills usually carry the heaviest road film and benefit most from stronger pre-cleaning.

Frequently Asked Questions

Is Vorreiniger B stronger than Gentle Snow Foam?

Yes. Vorreiniger B is a stronger alkaline pre-cleaner designed for heavier contamination.

Can I use it on protected vehicles?

It can be used with care, but stronger alkaline cleaners may reduce some waxes or weaker protection if used too often.

Is it for weekly washing?

It is better used when heavier cleaning is needed, not as a gentle weekly maintenance shampoo.

Pre-Wash Application

1. Work on a cool surface and avoid direct sunlight.


2. Dilute according to the level of contamination and application method.


3. Apply to lower panels, heavily soiled areas or the full exterior where appropriate.


4. Allow a short dwell time to loosen dirt and road film.


5. Do not allow the product to dry on the surface.


6. Rinse thoroughly with high-pressure water.


7. Follow with a contact wash using a suitable shampoo.

Professional Use Notes

1. Use stronger dilutions only where needed.


2. Test on sensitive surfaces first.


3. Avoid overuse on delicate waxes or fresh protection layers.