Is the auto wash solution or a concentrate? Dilution? Use with Karcher 2400 with black nozzle and siphon at max?

Yes, this is an auto wash solution and concentrate. I mix the amount recommend with water in the Karcher washer. The mixing amount is measured by filling the small upper chamber and pouring in the machine. It is enough to do a fairly large auto. I am not familiar with the 2400; therefore, I can only offer limited instructions. I use another type karcher.

Amazon is saying this can't be shipped to my address. Is it illegal in California for some reason?

I don't know about this particular product, but I did live in California. The main reason that this product can't be shipped to your state is because Califorinia health agency is a consumer health protection watchdog that goes through every product imaginable and will not allow any products to be used because they may be known to cause cancer in animals or humans. California is more strict about cleaners, pesticides, auto exhaust than any other state. Hope that helps.

My pressure washer mixes a 20 to 1 ratio itself. So should I dilute this quart to five gallons first, and then fill the tank with it? Thank you.

I have the 1600 PSI Ryobi model that automatically dilutes at 20 to1. I just got an answer about this from a Ryobi agent: Agent, "You do not need to dilute the pressure washer detergents in this pressure washer. It will automatically dilute as it comes out of the pressure washer."

I can not find this on their website. Do you mix this with water as directed, then put that in the soap tank on your pressure washer?

Yes, the mixture is 20oz of water to 1oz of soap.

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✨ Wash smarter, shine brighter with Kärcher’s pressure washer magic! 🚿

STREAK FREE SHINE - Rinse away dirt and grime effortlessly, revealing your vehicle’s original showroom luster.
VERSATILE VEHICLE CARE - Ideal for cars, trucks, bikes, boats, and even heavy equipment—one solution for all your rides.
MADE IN THE USA QUALITY - Trust in a product crafted with American precision and reliability.
ONE QUART FIVE GALLONS - Stretch your cleaning power with a single quart making up to 5 gallons of premium wash.
PRESSURE WASHER PERFECTED - Specifically engineered to maximize the efficiency of your gas or electric pressure washer.

Kärcher Vehicle Wash and Wax is a highly concentrated, pressure washer-compatible detergent designed to clean and protect a wide range of vehicles including cars, trucks, bikes, and boats. One quart yields up to 5 gallons of cleaner, delivering a streak-free, residue-free shine while being made in the USA for trusted quality.

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Manufacturer	Karcher
Part Number	9.558-147.0
Item Weight	2.35 pounds
Product Dimensions	4.5 x 3 x 3.2 inches
Country of Origin	USA
Item model number	9.558-147.0
Is Discontinued By Manufacturer	No
Size	1 Quart
Color	Blue
Style	Vehicle Wash
Material	Plastic
Thickness	1 Inches
Volume	1 Quarts
Item Package Quantity	1
Measurement System	US
Special Features	Streak Free, Concentrated
Usage	Washing Cars, Trucks, Boats, RVs, Furniture, Heavy Equipment, & More
Included Components	Accessory
Batteries Included?	No
Batteries Required?	No

KärcherVehicle Wash and Wax, Pressure Washer Detergent, Cleans Cars, Bikes, Trucks, Boats and More, Highly Concentrated, Makes up to 5 gal of Cleaner

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