Gtechniq W4 Citrus Foam Pre-Wash PH Neutral
Gtechniq W4 Citrus Foam is a pH-neutral pre-wash designed to break down stubborn grime, road film, and bug splatter without harming waxes, sealants, or ceramic coatings.
Key Benefits
- pH Neutral & Coating Safe: Removes grime without stripping waxes, sealants, or ceramic protection.
- Powerful Citrus Degreasing Action: Breaks down road film, grease, and bug splatter with ease.
- High-Foaming Pre-Wash: Clings to surfaces to loosen dirt before contact washing.
- Versatile Application: Can be used through a foam lance or pump sprayer.
- Highly Dilutable: Effective at ratios up to 10:1 for economical use.
How to Use
- Use Out of Direct Sunlight: For best results, apply when the vehicle surface is cool.
- Shake Well: Mix the product thoroughly before use.
- Prepare Foam Lance: Add approximately 2.5cm (1 inch) of W4 Citrus Foam to your foam lance bottle and fill with warm water.
- Apply to Vehicle: Spray foam evenly from bottom to top to ensure full coverage.
- Allow to Dwell: Let the foam sit for 3–5 minutes to break down grime.
- Rinse Thoroughly: Rinse off with clean water before the product dries on the surface.
PRO TIP: Use W4 Citrus Foam as a pre-wash before contact washing to safely remove heavy grime and reduce the chance of wash-induced swirl marks.
Dilution calculator
Pick your container and your ratio, and read off how much concentrate to pour.
A foam cannon does not spray its bottle. It draws from the bottle into the pressure washer's flow, so a 1 L bottle can put 11 L on the car and the ratio in the bottle tells you nothing about what reaches the paint. Measure your setup once and the number holds for every product that quotes a PIR.
Nothing matches that. Check the product's own page for its ratio.
Common questions
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Parts water to one part product. A 10:1 mix is ten parts water and one part product, so a 1 L bottle takes 91 ml of product and 909 ml of water. A few brands print theirs the other way round, so check the label if a number looks unusually strong.
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Water first, then the concentrate. Pouring concentrate into an empty bottle and topping it up makes it foam over the top, and you lose some of what you just measured.
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Most diluted products keep for a few weeks in a sealed, labelled bottle out of sunlight. Write the product and the ratio on the bottle. An unlabelled trigger bottle is how the wrong chemical ends up on someone's interior.
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Panel Impact Ratio is the concentrate as a percentage of everything leaving a foam cannon, the bottle water and the pressure washer water together. It matters for snow foam and pre-wash only, because a cannon draws from its bottle into the washer's flow rather than spraying the bottle.
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A syringe or a measuring jug with millilitre graduations. Capfuls vary by bottle and by how full you fill them, and at 256:1 a few millilitres out is a noticeable change in strength.