Foamers, chemical injectors, surface cleaners and gutter kits. The accessories that turn a pressure cleaner into a system. A downstream injector draws chemical at low pressure, a foam cannon lays a clinging foam that gives the chemical dwell time, and a surface cleaner does flat concrete in a fraction of the time a lance takes.

Injectors are rated by their draw ratio - a 3:1 draws stronger than a 6:1 - and they only work at low pressure, so you need a detergent nozzle in the lance for them to pull. Brass suits general detergents, stainless is what you want if bleach or acid is going through it. Surface cleaners need the flow to match the deck size, or the bar will slow down and streak.