PSI, GPM and Cleaning Units. What are They? A Simple Guide

Pressure washing walls is an effective way to restore the appearance of a property, remove built-up grime, and maintain the structural integrity of exterior surfaces. Over time, walls—whether brick, concrete, vinyl, or rendered—accumulate dirt, algae, mould, mildew, and pollution stains that not only make them look neglected but can also cause long-term damage if left untreated. The process begins by assessing the wall type and choosing the right pressure setting and nozzle—too much pressure can