I have used the Auto-Foam dilution calculation method, but the calculation is telling me I need more Auto-Foam than my detergent bottle will hold!

Some pressure washer machines won’t discharge material from their bottle or reservoir at a rate high enough to achieve 4% dilution, even the bottle full and the discharge rate set to its highest.

In these cases, fill the detergent bottle up to full with Auto-Foam and see what sort of results you can achieve at the maximum dilution possible. It can clean reasonably well at rates as low as 1-2% so it is worth a try.

You can also apply the product with a garden pump sprayer at 4%, as the foaming up action is not important for cleaning, and pressure wash this off using your pressure washer with just water.