Cleaning Your Crawler After a Run: A Simple Routine That Actually Works

Here’s the honest truth about cleaning your RC crawler: most people don’t do it enough, and a few people overdo it. I’ve been in both camps.

In my early days back with the hobby I was washing my rigs after every single outing — full disassembly, water rinse, hours of drying time. That’s overkill for a trail day. On the other end, I’ve let trucks sit for a week after a muddy run without touching them, and that’s when you start finding grit in bearings and dried mud in places it shouldn’t be.

The middle ground is a simple post-run routine that takes fifteen minutes and keeps your truck in good shape without turning maintenance into a second hobby. Here’s what I actually do.

Do This Right After Every Run

Get the Mud and Debris Off Quickly

The worst thing you can do is let mud dry and harden on the truck. Dried mud is significantly harder to remove than wet mud, and it gets into every small gap in the chassis, suspension, and drivetrain. If you can get to cleaning within an hour of running, you’ll save yourself a lot of work.

I keep a bucket of water and a few old toothbrushes in the garage specifically for this. A stiff brush and some running water handles the bulk of the trail debris without requiring anything more elaborate. For the tires and wheels, a dedicated scrub brush works better than a toothbrush — there’s more surface area to cover and you want something with a bit more bristle pressure.

Compressed Air Is Your Best Friend

After the water rinse, compressed air is the most useful thing in my cleaning arsenal. A can of compressed air from any office supply store works, and a small air compressor is an even better investment if you run regularly.

Compressed air gets moisture and debris out of areas you can’t easily reach with a brush — inside the motor can, around bearings, in the gaps between the chassis rails, under the body. Blow it out while the truck is still wet and you prevent a lot of the debris that would otherwise migrate somewhere inconvenient as the truck dries.

I blow out my motors every run without exception. The small motor in the SCX24 especially benefits from this — it’s a tiny brushed motor that’s close to the ground, and it picks up more trail debris than you’d expect. A quick blast of compressed air after every outing keeps it running cleanly.

Dry It Properly

This step gets skipped more than any other, and it causes more problems than almost anything else. Water sitting in bearings causes rust. Water on electronics causes corrosion. Neither of these develops overnight, but over weeks and months of wet runs with insufficient drying time, you start seeing bearings get rough and electronics act finicky.

After the rinse and compressed air, I leave my rigs upside down on a towel for a while — long enough that the obvious water has run out and the surface is dry to the touch. For a really wet trail run, or if I drove through any standing water, I’ll leave the truck sitting overnight before putting it away.

One additional note on electronics: the TRX4M and SCX24 are both reasonably weather resistant — you’re not going to kill them by driving through a puddle. But “weather resistant” doesn’t mean waterproof, and sustained immersion or deep water crossings are different from incidental splashes. Know the difference.

Do This Periodically (Not Every Run)

Check and Lubricate the Drivetrain

Every few runs, I’ll take a few minutes to check the drivetrain. On my crawlers this means spinning each wheel by hand and listening — bearings that are getting dirty or wearing out will feel rough or make a slight grinding sound when you rotate them. Clean, healthy bearings spin freely and quietly.

Axle shafts and drive cups benefit from occasional lubrication. A light application of silicone-based grease in the drive cups keeps things moving smoothly and prevents wear. Don’t overdo it — too much grease attracts dirt and creates more of a problem than it solves.

The diffs on most crawlers are sealed and don’t need regular maintenance, but if you’re hearing grinding or feeling a binding sensation when driving, it’s worth a look. This gets into more involved disassembly territory, but it’s worth knowing the symptom.

Inspect the Suspension Links

After a run that involved rough terrain or any hard hits, a quick visual inspection of the suspension links is worth the thirty seconds it takes. Links can bend, particularly on the smaller scale rigs, and a bent link will affect handling in ways that aren’t always immediately obvious. Run your eye along each link and make sure nothing is noticeably bowed or out of alignment.

This is also a good time to check that all your link mounting hardware is still tight. Thread locker helps, but trail vibration eventually works on everything. A quick check with the appropriate hex driver takes seconds.

Inspect the Body

Polycarbonate bodies are durable but not indestructible. Check for cracks, especially around body post holes where stress concentrates. A small crack can become a large one if it’s ignored. If you catch a crack early, a small bead of thin CA glue wicked into the crack will stabilize it before it propagates further.

While you’re looking at the body, make sure all the body clips are present and properly seated. I’ve had body clips work loose on the trail and not noticed until I got home. It happens. Check them, and keep a small supply of replacement clips in your parts bin because they are inevitable casualties of active trail use.

The Battery Conversation (Again)

I covered batteries in more depth in the batteries and chargers guide, but since we’re talking about post-run routine: storage charging your LiPo packs after every outing is part of maintenance, not just a battery safety thing. A pack left fully charged in your parts bin will degrade faster than one that’s properly storage charged. Two minutes on the charger after a run extends the life of your packs meaningfully.

Keep It Simple

The more complicated you make your maintenance routine, the less likely you are to actually do it. My honest post-run checklist is:

Brush and rinse the mud off while it’s still wet. Hit everything with compressed air, especially the motor. Let it dry upside down before storing it. Storage charge the packs.

That’s the core of it. Everything else — drivetrain checks, link inspection, bearing lubrication — fits into a slower maintenance rhythm, done every few runs or whenever something seems off.

A clean truck runs better, lasts longer, and is a lot more pleasant to work on when something actually does need attention. Fifteen minutes after a trail day is worth it.

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See also: Essential Tools for Your Bench and Trail Bag · Best LiPo Batteries for Micro Crawlers · Crawler Tires by Terrain · Recommended Gear

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