Why Is My Whiteboard Marker Not Erasing?

A teacher in r/Teachers was spraying cleaner on the board every time they erased anything, and getting tired of it. The markers, they wrote, just stick and spread. The reply with the most votes turned the question round: it sounds like a whiteboard problem, not a marker problem.

Both were on to something, but a hundred comments never settled which. If your board keeps a grey shadow of last week however hard you wipe, this is how teachers found the culprit, and what they bought afterwards.

What is whiteboard ghosting?

Ghosting is the faint grey trace of old writing that stays after the eraser has been over it. Smudging is its louder cousin: ink that spreads under the eraser instead of lifting.

A company that sells whiteboard paint lists the usual causes: a board with a porous coating, markers made with harsher solvents, ink left on too long, and an eraser so loaded with old pigment that it pushes it deeper in rather than off. That's a list from somebody selling a new surface. The order teachers check things in is the more useful one.

Is it the marker, the board or the eraser?

One teacher settled it for their own classroom with a swatch test. Old markers and new ones side by side on the same board, then wiped. The new ones were harder to erase, so it wasn't only the board. That's the whole method, and it takes two minutes. Three checks, cheapest first:

• The eraser. Felt erasers get saturated, and a loaded one moves old pigment around rather than off. That thread asked how old the erasers were, and several teachers have given up on erasers altogether in favour of a microfibre cloth. The teacher who started it had already replaced theirs, which is why the question moved on.
• The board. Clean one corner properly (the next section says how), let it dry, and write on it with the marker you suspect. Writing that wipes off the clean corner and nowhere else means the board is the problem. One teacher spent months spraying alcohol on a board they'd been warned stains easily, before a colleague told them to check for the protective film. It was still on, covering the whole board.
• The marker. On the clean corner, write the same word with the suspect marker and with any other one, an old one from the drawer or a different brand. Let both dry, wipe both dry. If one leaves a shadow and the other comes away clean, that's the swatch test above, and it's your answer.

How to fix whiteboard ghosting

The threads share a few fixes and argue about most of the rest.

Rubbing alcohol on a cloth comes up again and again. Hand sanitizer does the same job. One teacher erases with the felt eraser first, then goes over the board with straight isopropyl on microfibre to lift what's left. Somebody who cleaned a school over the summers says alcohol takes the film off without leaving one of its own, the way cleaners do.

WD-40, wiped on and buffed off, is the fix for a board that's gone hard to erase. Several teachers polish the board with it, and one does it every short week and holiday because the effect wears off. A teacher with two walls of whiteboard needed three months of weekly treatments before their new markers would erase properly. Let it air-dry before you write, or the writing smudges.

Plain water on a cloth is the quiet one. One teacher reckons a spray bottle of water beats the branded cleaner, and another washes the board with water to undo the film that wipes leave behind.

Two things to stop doing. Baby wipes and disinfectant wipes leave a film that stops the board being dry-erase. One teacher traced their residue to the custodians cleaning the boards with the desk spray.

Magic Erasers come up in thread after thread and get told off in each one. They're melamine, which is fine sandpaper, and they take the coating off a cheap board. A ceramic-on-steel classroom board shrugs them off, says one teacher who has both kinds.

Once the board is back to bare, a calendar grid you'd rather not redraw after every wipe can be drawn in a marker the eraser leaves alone.

Did Expo change its markers?

Yes, and the maker says so. Newell Brands, which owns Expo, put out a press release in March 2026. A new ink was introduced in 2025 across the full dry-erase line, brighter and more saturated than before. On erasing, the release says what every marker box says, which is "clean erasing", and nothing more.

The threads about Expo markers not erasing tell the other half. The teacher who ran the swatch test had bought the same chisel tips as always, and the first one wouldn't come off until they leaned on the eraser.

A teacher in r/CanadianTeachers spent four months blaming bad batches and old boards, and bought new boards. Then they looked at the box, which said "New Ink" in the top corner. Another had used Expo since 2016 with no trouble until the last two years, on a brand-new board nobody else writes on.

The new ink is a fact and the harder erasing is a report. Newell declined to comment when a student newspaper asked.

Colour muddies it further. Red has always been bad for erasing, says a teacher who otherwise likes the new ink. Green doesn't erase for another, and a third finds purple the clean one, which the student paper's own test found the streakiest. Black gets the fewest complaints, and one teacher's rule of thumb is that a black marker that won't erase means a board problem.

Dry-erase markers that actually erase

This is where teachers went, in three separate threads, without being asked.

Crayola Take Note is the name that comes up most. The teacher with the brand-new board switched to a pack and found every marker in it erases perfectly. The chisel-tip four-pack is the standard set, and there's a fine-line version for anyone who writes small.

In another thread, a teacher whose Expo always left residue, whatever they erased with, switched too. Their custodian bought boxes for the whole floor, because the boards stopped being a pain to clean. A third says they're bolder and last longer, and erase cleanly except the orange and yellow.

Pilot V Board Master is the other name, and the teachers who use it talk about how long it lasts more than how it erases. It's refillable: WeAreTeachers says each pen takes up to four refills. One teacher has used the same set for almost eight years, and another is on year six.

The teacher who ran the swatch test ordered a set when it was over. One complaint is that the tips are too thin for a teacher who wanted a wedge, and another wishes they came in more colours. The five-pack with a refill for each marker is the chisel-tip set.

A few switched to Bic instead, and one reports no residue, which makes three brands teachers reached for on their own.

Start at the corner, not the shopping cart. Rubbing alcohol on a cloth, one corner, let it dry, then the suspect marker and any other one side by side, and wipe both dry. A board that wipes clean under the second marker has told you what to buy.

The Take Note four-pack is the one most of them named, with the refillable Pilots for anyone who'd rather buy once. A board that ghosts under both is a board problem, and the alcohol and the WD-40 are tomorrow afternoon's job.