Silica scale and water spot remover with peeling effect. With its acidic power, OVERcoat pH- effectively removes stubborn dirt, scales, water spots, and ionic deposits. Ideal for pre-washing, resetting any surface. Dilute as necessary to remove from light to stubborn stains.


Compatible With Everything

OVERcoat pH- is a versatile product with a wide range of applications. You can dilute it and use it in buckets, spray bottles, high-pressure pump sprayers, foam guns, and more. Even stubborn stains can be removed with the undiluted solution.

How To Use

Contact Wash

STEP 1 Add 30ml of OVERcoat pH- to a 10L bucket of water and lather with a hose.

STEP 2 Rinse your vehicle, then dip a sponge or mitt of your choice into the bucket and apply it to the surface.

STEP 3 Rinse your car thoroughly and dry it with a microfiber towel.

Straight (Strong Wash)

STEP 1 Be sure to wash a small section of your vehicle when using this method. Rinse the surface, then apply OVERcoat pH- with an applicator, sponge, or mitt of your choice.

STEP 2 Aim the stubborn stains and rub gently to avoid creating suds.

STEP 3 Immediately rinse the area thoroughly and dry with a microfiber towel.

OVERcoat pH-

OVERcoat pH-
Acidic Car Shampoo

・Content: 500ml (16.9oz)

・Dilution Ratio: 30ml (1oz) : 10L (2.64gal) of water*

・Usage: 16x*

・Accessories: Push-Pull Cap, Measuring Cup

*Dilution and usage can vary.


Shipping & Tax Included



It can be diluted in sprays, pump sprays and foam guns.

Dilution Ratio:
1~2oz to 2.64gal of water
Spray: 1oz to 33.8oz of water
Pump Spray: 1oz to 33.8oz of water
Foam Gun: 1oz to 33.8oz of water



Do not drink. If ingested, do not induce vomiting. If the liquid gets into your eyes, rinse immediately with water. Seek medical attention if any abnormalities occur. Store out of the reach of children in a cool, dark place.The product may undergo discoloration, but this does not affect its effectiveness. Effects may vary depending on the surface. If unsure about the effect on a specific surface (windshield, aluminum, etc.), please test on an inconspicuous area. Please note that the undiluted solution is a powerful cleaner and wiper scratches that were originally on the windshield may be noticeable. Do not use undiluted solution on side mirrors. When using the undiluted solution, apply by small sections rather than the entire surface and wash it off immediately. Avoid leaving the liquid on the surface for extended periods of time. Please note that when using the undiluted solution, the existing coating layer may peel off. Do not wash your car continuously with undiluted solution. Do not use on deteriorated clear coatings, glass, wheels(cracks, scratches), or peeling paint. Do not use undiluted solution on aluminum, alumite, magnesium, polished, chrome, plated, stainless steel, and metals as it may cause discoloration or deterioration. Do not use in direct sunlight, windy days or on a hot vehicle surface. To prevent stains and water spots, ensure that the water does not dry naturally after washing. The use of protective gloves is recommended. Wash your hands thoroughly after use. The product is biodegradable. OVERCOAT JAPAN is not responsible for any injuries caused by incorrect and improper use of the product. Read this carefully before using this product. Composition: Water, glycolic acid, sulfamic acid, surfactants, dyes, fragrances.

Frequently Asked Questions (FAQ)

Q. What is "surface reset" and how does the peeling effect work?

A. OVERcoat pH- is a strong car shampoo that is designed for maximum cleaning efficiency against tough dirt, hard water and other stubborn grime, peeling the hard minerals out and being capable to reset any surface.

Q. Is strong car shampoo safe to use?

A. Although it has a strong effect, it is pH balanced to prevent damaging the clear coat.

Q. How do I remove stubborn scales from glass?

A. Apply the undiluted solution to an applicator and rub gently to avoid creating suds. Wash the applied area thoroughly.

Q. How often do I need to wash my car?

A. It depends on factors such as the environment and how often the vehicle is used, but as a guideline, once every two weeks is the best time to use it diluted.

Q. What kind of surfaces can it be used on?

A. Bodywork, glass, windows, tires, wheels, fender liners, rubber, plastics, engine bay.

Q. When should I use the push-pull cap?

A. Soon after opening the product, throw the original cap and replace it for the push-pull cap.

Q. Where should it be stored?

A. In a cool and dark place, out of the reach of children.

Q. Does discoloration occur?

A. The product may undergo discoloration, but this does not affect its effectiveness.

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