A pressure washer uses an electric motor or gas engine to power a high-pressure pump, blasting water through a specialized wand and nozzle. In automotive shops, it is a vital tool for cleaning greasy engine bays, dirty wheel wells, and chassis before performing repairs. Removing thick layers of road mud and baked-on oil lets you inspect components properly and prevents grime from falling into sensitive assemblies during work.
When washing under the hood, keep the spray clear of electrical connectors, fuse boxes, and alternator inlets. The high pressure can easily force water past rubber seals, causing corrosion and electrical shorts. Choose the correct nozzle angle for the job, as a narrow zero-degree red nozzle can slice through tires or strip paint. Use a wide 25-degree or 40-degree spray pattern for safe, general cleaning.