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Panel Impact Ratio (PIR) tells you exactly how much shampoo concentrate reaches your car panel — not just what's in the bottle. Use our free foam cannon calculator to dial in your exact mix for any pressure washer and cannon setup, then learn how to measure your output in four simple steps.

This guide covers everything you need to keep your car's interior clean, protected, and smelling its best. Whether you're maintaining a daily driver or a weekend car, this step-by-step process is tried and tested.