Nozzles are the cheapest part on your rig and one of the most common reasons jobs go wrong. A worn or clogged nozzle cuts your effective pressure by 20-30%, causes uneven spray patterns, and can damage surfaces you're supposed to be cleaning. Here's what you need to know about keeping them working and when to replace them.

The Quick Answer

Here's the short version on pressure washing nozzle maintenance:

Inspect: Before every job. Look for cracks, erosion, and uneven spray pattern.
Clean: Use a cleaning needle to clear blockages. Soak in white vinegar for stubborn clogs.
Replace: When pressure drops 10-15% below normal, or on any visible damage.
Cost: Quality replacement nozzles run $3-$15 each. Keep a full spare set in the truck at all times.

A $5 nozzle can ruin a $300 job if it's worn out or clogged. Inspect them before every use. Keep reading for the full process.

Pressure Washing Nozzle Types: A Quick Reference

Every nozzle is color-coded by spray angle. Using the wrong one on the wrong surface is how you strip paint, crack vinyl, or blow out mortar joints.

Red (0°): Pinpoint stream. Highest concentration -- can cut skin. Only for the toughest industrial stains on bare concrete. Not for most jobs.
Yellow (15°): Stripping paint, removing heavy grime. Use with caution on wood or softer surfaces.
Green (25°): General purpose. Driveways, concrete, vehicles. The nozzle you'll use on most jobs.
White (40°): Gentler fan. Windows, painted surfaces, siding, and screened areas.
Black (65°): Low pressure. For applying soap and detergents only -- not rinsing.

Beyond color, the nozzle orifice size (measured in thousandths of an inch) must match your machine's PSI and GPM. Going too small creates back-pressure that can damage the pump. When replacing nozzles, match the same orifice size as the originals unless your equipment specs call for something different.

How to Clean a Clogged Nozzle

Clogs happen from hard water deposits, chemical residue, and debris. Here's the right way to clear them without damaging the tip.

Step 1: Remove the nozzle safely

Turn off the machine and release all pressure before pulling any nozzle. Squeeze the trigger a couple of times after shutting off the machine to bleed the line. Never remove a nozzle under pressure.

Step 2: Clear with a cleaning needle

Insert the small cleaning pin (comes with most nozzle kits, also sold separately for $2-$5) into the orifice opening. Work it back and forth gently to break up the blockage. Then rinse the nozzle under running water with flow going backward through the tip -- opposite the normal spray direction. This flushes debris out the back.

Step 3: Soak for stubborn clogs

If the pin doesn't clear it, drop the nozzle in white vinegar and let it soak for several hours. Overnight works well for heavy mineral buildup. Vinegar dissolves calcium and lime deposits without attacking the metal. Rinse thoroughly after soaking and test the spray pattern before reinstalling.

Step 4: Test before putting it back

Hold the cleaned nozzle up to light. The orifice should be open with a clean, round shape. If it's still blocked, deformed, or cracked, replace it. Don't reinstall a questionable nozzle -- you'll be troubleshooting pressure problems all day.

When to Replace Pressure Washing Nozzles

Most contractors wait too long to swap nozzles. Here's what to watch for.

The 10-15% pressure drop rule

Water velocity and chemical exposure gradually wear the orifice opening larger. A bigger orifice means lower pressure at the same GPM -- your machine produces the same flow, but less force. When effective pressure drops 10-15% below what a new nozzle delivers, replace it. Keep a reference nozzle for comparison if you want to track this.

Uneven spray pattern

A worn nozzle rarely fails cleanly. Watch for a fan that drifts to one side, gaps in the spray, or an irregular edge to the pattern. Run a test spray on clean pavement and step back to look at it. It should be a sharp, even fan. Anything else means the orifice is damaged or worn.

Visible damage

Cracks, chips, or visible erosion around the orifice rim -- replace immediately. A cracked nozzle can fracture under pressure, and the spray becomes unpredictable. Not worth the risk on a customer's property.

Replacement frequency for working contractors

Running 3-5 jobs per day? Plan on replacing your main working nozzles every 6-12 months. High-chemical jobs (house washes with SH, rust treatment) wear nozzles faster than plain water applications. A full replacement set costs $15-$40. Buy a few sets and keep them stocked.

Nozzle Storage Best Practices

How you store nozzles between jobs has a real effect on how long they last.

Store in a nozzle holder or labeled case -- not loose in a toolbox where they get dinged up
Keep them dry and away from direct sunlight. UV degrades plastic components over time.
Never leave nozzles soaking in chemical solution longer than needed -- it accelerates corrosion on the metal tip
Label your spare nozzles by angle so you're not guessing mid-job

The Mistake That Wastes 30 Minutes Per Call

Here's the thing most guys get wrong: they notice reduced pressure and start chasing the problem through the pump, the unloader valve, and the hose fittings. Thirty minutes later they're still troubleshooting. Then they swap the nozzle and the problem is gone.

A worn orifice is one of the most common causes of pressure loss. It's also the cheapest and fastest fix. If your pressure feels off, swap in a fresh nozzle first. Nine times out of ten, that's your answer.

Bottom Line

Inspect nozzles before every job, clean them with a pin and vinegar when clogged, and replace them when pressure drops or spray pattern goes uneven. Keep a full spare set on the truck. It's a $20 investment that protects a $2,000 machine and the quality of every job you do.

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Pressure Washing Nozzle Maintenance: When to Replace and How to Clean (2026)