Best Foam Cannon Soap Ratio (Without Wasting Product)

Want thick foam and great cleaning power—without pouring money down the drain? Here's how to dial in the perfect foam cannon dilution every time.

Why Soap Ratio Matters

Too little soap and your foam is watery. Too much and you're just wasting product (and possibly stripping protection).

The right ratio gives you thick, clinging foam that lifts dirt without removing wax or ceramic spray protection.

Most foam cannons hold about 32 oz of liquid. You’ll fill that bottle with a mix of car soap and water.

Here’s what affects how much foam you get:

With The Super Soaper, a little goes a long way. It’s designed to foam thick without needing huge amounts of product.

Recommended starting ratio:

This gives you the perfect blend of foam, dwell time, and lubrication—without wasting product or risking damage to coatings.

If your foam is too thin:

If your foam is too thick or using too much product:

Pro Tip: Write your perfect ratio on your foam cannon with a Sharpie once you find it.

Pump sprayers use less product, so you’ll only need about 2 oz of The Super Soaper per 32 oz of water for effective foam and cleaning action.

It won’t be shaving cream-thick—but it works great for pre-treating lower panels, bugs, and wheels.

Don’t waste soap or time guessing. Start with:

Then adjust based on your pressure washer and climate. Simple.