TL;DR
A sander that suddenly throws dust everywhere almost always has a blocked dust port or plugged pad holes, and clearing both takes about ten minutes. Unplug it or pull the battery first, and never rinse a sander to clean it.
Unplug it before anything else
Pull the plug or remove the battery pack. A sander pad that starts spinning while your fingers are in the hook-and-loop is a fast way to lose skin.
Work over a trash can or outdoors. What comes out of a sander is fine dust, and you do not want it in the room you are standing in.
Wear a dust mask and eye protection. Fine wood dust and silica-containing drywall dust are a breathing hazard, not just a mess.
If you have been sanding old paint, treat the dust as potentially lead-bearing and clean up wet rather than dry. That is a job with its own rules, and a professional testing kit is the honest starting point.
Why is my sander not collecting dust?
A sander stops collecting dust when the dust port is packed, the holes in the sanding disc no longer line up with the pad holes, the pad holes themselves are plugged, or the collection bag or vacuum filter is full. Check them in that order, because the port and the pad account for most cases.
Hook-and-loop pads clog from the inside out. Dust packs into the base of the loops and into the extraction holes and stops moving air.
A misaligned disc is the sneakiest cause. If the holes in the abrasive do not sit over the holes in the pad, collection drops to near zero even though everything looks clean.
Static also plays a role in a dry shop. Dust clings to a plastic port and builds a ring that narrows the passage.
Clearing the dust port
Pull off the bag or the vacuum hose and look into the port with a light. Most clogs are visible.
Run a bottle brush, a pipe cleaner, or a bent piece of wire through the passage. Work it back and forth and tap the sander to shake material loose.
Then blow it out with compressed air at moderate pressure, aiming so dust leaves the tool rather than being driven back into the housing. This is the general rule behind why power tools need compressed air, not water.
Check the elbow or adapter too. Those transition pieces have the narrowest cross section in the whole path and clog first.
If the sander connects to a shop vacuum, the vacuum side is just as likely to be the problem. Working through how to clean a wet dry shop vacuum filter is often what actually restores suction.
Cleaning the pad and its holes
Peel the abrasive disc off and look at the pad face. Every extraction hole should be open.
Poke each hole clear with a toothpick or a small nail. Do not enlarge them or ream the plastic.
Clean the hook-and-loop surface with a stiff nylon brush, brushing across the loops rather than along them. A short piece of the loop side of a hook-and-loop strap also works well as a cleaning pad.
Vacuum the pad face afterward. Brushing releases the dust; vacuuming removes it.
Check the pad for damage while it is exposed. A pad with torn hooks, a crumbling edge, or a worn face will not hold discs and is a wear item meant to be replaced.
Can you clean a sanding disc and reuse it?
Yes, in many cases. Sanding discs that look worn are often just loaded with resin and dust, and running a rubber abrasive cleaning stick, sometimes called a crepe stick, against the spinning disc pulls the loading out and restores much of the cut. It will not fix worn-down grit.
Hold the crepe stick against the disc for a few seconds with the sander running and secured. Dust and rubber come off together.
This works best on discs loaded with softwood resin, paint, or finish. It does not restore an abrasive whose grit has actually worn away.
Look at the disc after cleaning. If the grit still feels sharp under a fingernail, keep using it. If it feels smooth, it is finished.
The bag, the canister, and the filter
Empty the collection bag when it is about half full, not when it is packed. A full bag chokes airflow long before it looks full.
Turn the bag inside out and brush it. The fabric pores are the filter, and clogged pores mean no collection even from an empty bag.
Canister-style collectors have a pleated filter inside. Tap it out dry and brush the pleats; wash it only if the maker says it is washable, and then dry it fully before use.
A damp filter is worse than a dirty one. Wet pleats clog instantly and can grow mildew inside the canister.
Wiping down the tool itself
Wipe the sander housing with a barely damp cloth and a drop of dish soap, then dry it. Spray the cloth, never the tool.
Keep liquid out of the vents, the switch, and the motor housing. That rule holds for every power tool, which is the same reasoning as in how to clean a cordless drill and impact driver.
Blow out the motor vents with air. Sanders pull their own dust through the housing and clog faster than most tools in the shop.
Store the sander in a closed box or a case rather than open on a shelf. It will pull less shop dust into itself between jobs. The rest of the workshop routine is in our guide to cleaning tools, yard gear, and hobby equipment.
FAQ
Why does my orbital sander throw dust everywhere?
Either the dust path is blocked or the abrasive holes do not line up with the pad holes. Check the port, the adapter, the pad holes, and the bag or vacuum in that order. Also confirm the disc is seated so its holes sit directly over the pad holes, since a rotated disc kills collection completely.
How do you clean the holes in a sander pad?
Peel the disc off, then clear each extraction hole with a toothpick or a small nail without enlarging it. Brush the hook-and-loop face across the loops with a stiff nylon brush to release packed dust, then vacuum the pad. Replace the pad if the hooks are torn or the edge is crumbling.
Can I wash a sander dust bag?
Check the manual first. Many fabric bags can be hand washed in warm water, but they must be completely dry before reuse, since a damp bag clogs immediately and can grow mildew. For most bags, turning them inside out and brushing the fabric restores airflow without any water at all.
What is a crepe stick for sanding discs?
A crepe stick is a soft rubber block held against a running sanding disc to pull loaded resin, paint, and dust out of the abrasive. It restores cut on discs that are clogged rather than worn. It does nothing for grit that has actually worn down, so check the disc by feel afterward.
Can I use water to clean a power sander?
Only a barely damp cloth on the outer housing. Water in the motor, the switch, or the bearings causes corrosion and failure, often days later rather than immediately. Clear the dust path with brushes and compressed air, and spray any cleaner onto the cloth rather than onto the tool.
How often should a sander be cleaned?
Empty the bag or canister at about half full, clear the pad holes whenever you change discs, and blow out the motor vents after each substantial sanding session. Sanders pull their own dust through the housing, so they need this more often than almost any other tool in a home shop.
Sanding day makes dust everywhere, and the house usually shows it. If you would rather hand that part off, our house cleaning services can take it. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.