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October 06, 2026 7 min read
Knowing how to clean a paint spray gun properly is just as important as knowing how to use one.
Paint left inside the fluid passages, nozzle, or air cap can dry and cause problems the next time you use the gun. A few minutes of cleaning after every paint job can prevent clogged passages, poor spray patterns, sticking components, and a lot of unnecessary aggravation.
I've been painting and working on cars for more than 40 years, and cleaning the gun when I'm finished is simply part of the job.
In the video below, I'll show you exactly how I clean my paint spray gun after using it.
The first thing I do is remove the paint cup.
I use TCP Global disposable paint cups, so when I'm finished spraying, I can remove the disposable cup instead of cleaning a conventional reusable paint cup.
That makes cleanup considerably easier, but don't make the mistake of thinking the gun is clean just because the cup is gone.
There's still paint inside the gun.
You don't need to fill every part of a spray gun with solvent to clean it. You need to concentrate on the areas where the paint actually travels.
Paint enters through the fluid inlet, travels through the gun's fluid passage, and exits through the fluid nozzle.
That's thefluid path, and that's where most of the cleaning needs to happen.
Understanding this also makes a spray gun a lot less mysterious. The entire gun isn't full of paint. You're cleaning a specific path through the gun and the components that control the paint as it leaves.
Before taking the gun apart, I remove most of the remaining paint with an initial flush.
For the solvent-based automotive materials I'm working with here, I put a small amount of lacquer thinner into the fluid inlet.
Then I pull the trigger and allow the thinner to wash through the fluid passage and out through the nozzle.
You'll initially see paint mixed with the thinner.
I continue flushing until the thinner coming out of the gun runs clear.
That's a good indication that the majority of the paint has been removed from the fluid path.
Butrunning clear doesn't mean I'm finished.
There can still be paint remaining around the fluid needle, nozzle, internal passages, and air cap. That's why I disassemble the gun for a more thorough cleaning.
The correct cleaner depends on the material you're spraying and the recommendations for your particular spray gun.
In the process shown here, I'm working with solvent-based automotive coatings, so I use lacquer thinner for my initial flush.
For detailed cleaning after the gun is disassembled, I use 3M High Power Spray Gun Cleaner 26689.
If you're spraying a different type of coating, don't automatically assume lacquer thinner is the correct cleaner. Waterborne and other coating systems may require a different cleaning procedure.
Check the recommendations from the paint manufacturer and the manufacturer of your spray gun when you're unsure.
The important part is using a cleaner that's appropriate for the material you're removing and the equipment you're cleaning.
Once the initial flush is finished, I take apart the components on the fluid side of the gun.
I start by unscrewing the fluid control knob and removing the spring.
Then I squeeze the trigger and carefully pull out the fluid needle.
Next, I use a wrench to remove the fluid nozzle.
I also remove the air cap and the adapter for my disposable paint cup so I can clean those components individually.
Be careful with the fluid needle and nozzle. These are precision components. Damaging the needle or the seating surfaces of the nozzle can affect how the gun performs and potentially cause problems with the spray pattern.
Now I can clean the areas the initial flush couldn't completely reach.
For this part, I use 3M High Power Spray Gun Cleaner 26689.
The aerosol cleaner makes it easy to direct cleaner into the fluid passage and other areas where residual paint can hide.
I also use small spray-gun cleaning brushes to clean inside the passages when necessary.
This is where a visual inspection becomes important.
Look inside the fluid path.
If you still see paint, it isn't clean.
Continue cleaning until there's no visible paint remaining inside the passage.
It's a simple test, but it's one of the easiest ways to determine whether you've actually cleaned the gun instead of simply flushing solvent through it.
The fluid needle needs to be completely clean before it goes back into the gun.
I spray it with cleaner and wipe away any remaining paint.
Pay particular attention to the end of the needle where it seats against the fluid nozzle.
You don't want dried paint accumulating on a precision surface that's responsible for controlling paint flow.
Handle the needle carefully while it's out of the gun. Bending or damaging the tip can create problems that cleaning isn't going to fix.
Next, I clean the fluid nozzle.
I spray cleaner through the inside and make sure there's no paint remaining in the passage or around the opening.
Again, this is a precision component.
Don't attack the opening with something that can scratch it, enlarge it, or change its shape. The goal is to remove the paint without damaging the nozzle.
The air cap also needs to be clean.
The small openings in the air cap direct the airflow that atomizes the paint and shapes the spray pattern.
If those passages become partially blocked with dried paint, the gun may not spray the way it should.
Clean the air cap thoroughly, but be careful with the small holes.
You want them clean, not modified.
Avoid forcing oversized wire or other hard objects through the openings that could damage or enlarge them.
I also clean the disposable-cup adapter and any other removable components that have been exposed to paint.
This is one of the reasons I prefer taking the gun apart instead of relying only on flushing solvent through it.
Once everything is separated, you can actually see what you're cleaning.
There's no guessing about whether paint is hiding behind the nozzle or sitting on the needle.
Once the internal fluid path and individual components are clean, I give the exterior of the gun some attention.
I spray the outside with cleaner and wipe it down with a clean towel.
Paint buildup on the outside of the gun might not immediately affect the spray pattern, but there's no reason to let layer after layer accumulate.
When I'm finished, I want the entire gun clean.
Cleaning isn't the only part of spray-gun maintenance.
When I'm putting the gun back together, I use a small amount of Badger Needle Juice where appropriate on the needle and moving components.
You don't need much.
The goal isn't to fill the gun with lubricant. It's simply to keep the needle, trigger, and appropriate moving parts operating smoothly.
Be careful about putting lubricant where it doesn't belong. You don't want oil or lubricant contaminating the fluid path or anything that could eventually come in contact with your paint.
I use Badger Needle Juice as part of my regular spray-gun maintenance. I covered why I use it and where it belongs in The Spray Gun Lubricant I Never Skip.
Every time you use it.
Don't spray a job, put the gun on the bench with paint still inside it, and tell yourself you'll clean it later.
Wet paint is considerably easier to remove than cured paint.
The few minutes you save by skipping cleanup can turn into a much bigger job once material starts drying inside the gun.
If I'm finished painting, I'm cleaning the gun before I put it away.
I don't.
Flushing the gun until the solvent runs clear removes most of the paint, and that's an important first step.
But it doesn't necessarily tell you what's still sitting around the needle, nozzle, air cap, or other areas you can't see while the gun is assembled.
That's why I flush the gun first and then disassemble it for the final cleaning.
It doesn't take long once you get into the habit.
A spray gun depends on some very small passages and precision components to control fluid flow and atomization.
It doesn't take a huge amount of dried paint to start causing problems.
Poor cleaning can contribute to:
Restricted fluid flow
Clogged passages
Sticking components
Poor atomization
An inconsistent spray pattern
Contamination on your next paint job
Unnecessary wear or damage to the gun
And those are exactly the kinds of problems you don't want to discover after you've mixed paint and you're ready to spray.
Cleaning the gun isn't the glamorous part of painting a car, but it's part of producing consistent results.
My basic spray-gun cleaning routine is straightforward:
Remove the disposable paint cup.
Flush the fluid path until the cleaner runs clear.
Disassemble the fluid components.
Clean the internal fluid passage.
Clean the needle, nozzle, air cap, and cup adapter individually.
Inspect everything for remaining paint.
Clean the exterior.
Once everything is clean and lubricated, the next step is putting it back together correctly. If you haven't done it before, see my step-by-step guide on how to put a spray gun back together.
Lubricate the appropriate moving components during reassembly.
Then put the gun away clean and ready for the next job.
I've been painting and working on cars for more than 40 years, and this is one of those habits that becomes automatic.
You use the gun.
You clean the gun.
And you do it every time.
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This site documents real builds, tools, and shop work from my own projects. Some pages are showcases. Some are how-tos and tool reviews. If you’re working on a project and want experienced guidance, I offer one-on-one coaching.