How to Clean Litter Robot: Steps for LR3, LR4 and LR5

Quick answer: How to clean Litter Robot units, in short: press Empty to dump the litter, return the globe Home, then switch off and unplug. Lift off the bonnet and globe, wash the globe and waste drawer with mild soap and water, and let everything dry fully. Never soak or spray the base, skip bleach, and clean the sensors dry.

Whisker suggests a basic globe clean every 1 to 3 months and a deep clean at least every 3 months. More cats means more often.

The steps below follow the Litter-Robot 4 (LR4), which is the most common model. The Litter-Robot 5 and 5 Pro (LR5) and the older Litter-Robot 3 (LR3) differ in a few places, and I’ve flagged those, because one of them, sensor cleaning, is the opposite between models.

How Often to Clean a Litter-Robot

Whisker’s LR4 maintenance table, by number of cats:

Cats	Empty drawer	Spot clean	Deep clean
1	Every 2 weeks	Every month	Every 3 months
2	Every week	Every 2 weeks	Every 2 to 3 months
3	Twice a week	Every other week	Every other month
4	Every other day	Every week	Every month

The LR5 table is similar, with drawer emptying every 10 days for one cat. And the LR3 guide adds a quick wipe-down every couple of days.

What You’ll Need

The trick is having the cloths and liner ready before you unplug anything, so the robot isn’t sitting in pieces while you hunt for a bag.

mild dish soap and warm water, or Whisker’s cleaner spray or wipes
a soft brush (Whisker’s LR3 guide suggests a soft toilet brush for inside the globe)
a vacuum with a brush attachment
a clean, dry cloth, plus a microfiber cloth
dry cotton swabs
a non-bleach disinfectant for the base
a fresh drawer liner (white works best)
fresh clumping litter

How to Clean Litter Robot 4, Step by Step

1. Empty the Globe

Press Empty. The globe turns and dumps the litter through the waste port into the drawer. Sweep anything left toward the port, then press Cycle or Reset to bring it back Home.

Get every bit out. Whisker warns that wet litter turns into clay.

2. Power Down and Unplug

Turn the unit off and unplug it. Don’t skip this, even for a quick wipe. Remove accessories like the fence, shield or LitterHopper.

3. Open the Bonnet and Lift the Globe

Press and hold the buttons on both sides of the bonnet, then lift and rotate it open. Lift the globe off the base by its handle.

4. Pull the Carbon Filter

It sits under the globe. Push its top edge down to free it from the hooks.

5. Wash the Globe

Use Whisker’s cleaner, or water with mild soap. Whisker says there are no electronics in the globe, so a very dirty one can be soaked and hosed off.

Don’t use bleach or bleach-based products inside the globe. Whisker says they may create irritating fumes, and for a box your cat sits in, I’d treat that as a hard rule.

6. Clean the Drawer and Fit a New Liner

Wash the drawer, then wrap a fresh liner’s edges over the rim and push the bag to the bottom. My advice: press it flat. A stretched or bunched bag throws off the drawer full sensor.

7. Wipe the Base Without Wetting It

The base and control panel hold the sensors and electronics. Whisker is blunt: never submerge, spray or soak them.

Spray disinfectant onto a cloth, not onto the base, then wipe.

8. Clean the LR4 Sensors

This is the answer to how to clean Litter-Robot 4 sensors. Three laser “curtain” sensors sit in holes at the top of the bezel.

Wipe the bezel with a dry, clean cloth.
Vacuum around the inside of the bezel with a brush attachment, passing over the top holes.
If readings are still off, clean each sensor with a dry cotton swab. Whisker allows compressed air for the openings.

9. Dry Everything Completely

Don’t rush this. Damp parts plus fresh litter make clumps where you don’t want them. My take: give the globe a few hours, or leave it overnight when you can.

10. Reassemble and Test

Seat the globe on the base near Home, with its back flush in the rear bearing pocket and the gear track meeting the motor pinion. Rotate the bonnet down and push on the top until it latches. Whisker says the unit will not run without the bonnet.

Plug in and power on. When you see a solid blue light, it’s ready. Fill litter to just below the raised MAX line, then press Reset, since Whisker wants a Reset after any cleaning or litter change.

How to Clean Litter Robot 5 and 5 Pro: What Changes

Whisker’s deep cleaning guide covers both models. The big differences:

The bonnet only lifts away at about 45 degrees. It can’t come off when fully open.
Under the globe you may have a carbon filter or an OdorTrap holder.
The disinfectant must be non-bleach and non-ammonia.
The sensors are cleaned differently. Wipe the curtain sensor lens gently with a clean, dry microfiber cloth only. Whisker’s use and care guide says not to spray, use damp cloths, vacuums or forced air on the bezel sensors. Wipe the gas sensor and cameras with a soft microfiber cloth.
The liner is Whisker’s or a white 10 to 13 gallon bag.

After refilling litter to the MAX Fill Line, short-press Cancel to zero the SmartScale, then press Cycle once. A solid white light after the cycle means success.

Notice the conflict? When I compared Whisker’s guides side by side, this jumped out.

On an LR4 a vacuum is part of sensor care. On an LR5 it’s banned. That’s the one step I’d never copy between models.

How to Clean Litter Robot 3

The LR3 routine is close to the LR4, with a few extras from Whisker’s guide:

Press Empty, then any button to return Home. Empty the drawer, and in the app press Reset Gauge.
The carbon filter lives in the waste drawer, not under the globe.
The bonnet comes off by pressing the side latches and lifting while rotating it backward. Lift the globe by its top entrance edge.
The globe and drawer can be soaked or hosed. Whisker says not to use bleach on the units because it can degrade the plastic.
Wipe the two DFI sensors inside the waste opening so they don’t send a false “drawer full” signal.

To reassemble, set the globe straight in its tracks and turn the black key into the key pocket at the back. Add clumping clay litter to just below the MAX fill line, power on, and let it finish its first cycle.

Mistakes to Avoid

Honestly, the first one is the rule I’d tape to the wall.

Spraying the base. It holds the electronics on every model.
Using bleach. Whisker rules it out on the LR3, LR4 and LR5.
Reassembling while damp. Wet litter clumps early and can clog the ports.
Overfilling litter. Go to just below the MAX line. Too much throws off the scale, as covered in why a Litter-Robot is not cycling.
A sloppy liner. Whisker lists stretched or dark bags as a cause of false drawer-full alerts, explained in why a Litter-Robot is flashing blue.

For odor between deep cleans, see how to keep a litter box from smelling, or browse Litter & Litter Boxes.

Frequently Asked Questions

Can You Wash a Litter-Robot Globe in Water?

Yes. Whisker says the globe has no electronics, so you can soak it or hose it off. Dry it completely before adding litter.

How Do I Clean Litter-Robot 4 Sensors?

Wipe the bezel with a dry cloth, then vacuum around it with a brush attachment. For stubborn readings, use a dry cotton swab on each sensor. Whisker also allows compressed air.

Can I Vacuum the Litter-Robot 5 Sensors?

No. Whisker’s LR5 guidance says not to use vacuums, forced air, sprays or damp cloths on the bezel sensors. Use a clean, dry microfiber or lens cloth.

Can I Use Bleach on a Litter-Robot?

No. Whisker says bleach can create irritating fumes inside the LR4 globe and can degrade the LR3’s plastic. The LR5 guide rules out bleach and ammonia cleaners.

How Often Should I Deep Clean a Litter-Robot?

At least every 3 months, according to Whisker. Homes with more cats should clean more often, as often as monthly with four cats.

Last updated: November 10, 2026. Sources: Whisker: Litter-Robot 4 deep cleaning, Whisker: Litter-Robot 4 laser sensor cleaning, Whisker: Litter-Robot 5 and Pro deep cleaning and Whisker: Litter-Robot 3 deep cleaning.