Gtechniq Citrus Foam Car Shampoo W4 — 33.8 fl oz Concentrated Degreaser, Biodegradable

Gtechniq W4 is a concentrated citrus foam shampoo and degreaser that lifts road grime and oily deposits while remaining non-caustic and biodegradable.

Engineered for car enthusiasts and professional detailers alike, this 33.8 fl oz formula blends effective cleaning power with gentle chemistry. The citrus-based surfactants cut through grease and traffic film, producing thick foam that clings to paint for easier removal. Its non-caustic pH and biodegradable ingredients make it a practical choice when you want strong results without harsh chemicals.

How does Gtechniq W4 remove stubborn road grime?

W4 combines concentrated detergents and citrus solvents to break down oils, tar, and brake dust bonds on the surface. Foam helps suspend loosened particles so they wash away without aggressive scrubbing that can cause scratches.

• Foam clings to vertical panels for longer dwell time
• Citrus solvents dissolve oily residues and tar
• Concentrated blend spreads easily, minimizing product use

Is this safe for paint, wheels, and rubber trim?

The formula is non-caustic, designed to be safe on automotive paint, plastic trim, rubber seals, and most wheel finishes when used as directed. Always test a small hidden area if you’re unsure about an aftermarket coating or delicate finish.

• PH-balanced, non-caustic chemistry for general use
• Suitable for painted surfaces, plastic, and rubber when rinsed correctly
• Not abrasive—no need for aggressive mechanical action

How do I dilute and apply Gtechniq W4 for best results?

Mix according to the level of soiling—light wash to heavy degreasing—and apply with a foamer, foam gun, or bucket and mitt. Let the foam dwell briefly, agitate gently with a microfiber mitt if needed, then rinse thoroughly from top to bottom.

• Standard dilution for general cleaning: follow label guidance
• Use a foam lance or foamer for maximum contact time
• Rinse from top downward to avoid re-depositing dirt

Will Gtechniq W4 impact waxes or paint sealants?

Because W4 is a strong cleaner and degreaser, heavy use or high-strength dilutions may reduce wax or sealant durability over time. For maintenance washes on protected cars, use milder dilutions to preserve existing protective layers.

• Light dilutions maintain most waxes and sealants
• Use stronger mixes only for heavy contamination or wheel/tire cleaning
• Reapply protection after deep cleaning if desired

Who is this for: Gtechniq W4 is aimed at car owners, mobile detailers, and workshop professionals who need an effective, biodegradable cleaner that removes grease and road film without resorting to harsh caustics. It suits anyone looking for a concentrated shampoo that works in foam form for easier cleaning, especially before polishing or restoring vehicles.