What makes these erasers different from just a sponge (that's what they look like)? What scientifically speaking makes them special?

Excellent question. A sponge would disintegrate on multiple hard contacts with another surface. The chemicals in the markers would help this process along. These erasers have matrlerial that makes them more durable to multiple uses and stands up better to the markers. All they need is to be washed and dried every now and then. Sponges may be able to do the same thing, but would not last as long.

Can you wash them when they full of marker

So sorry it's taken me so long to respond. Yes, when marker gets on the eraser you can rinse it off. It's a great white board eraser!

Can these work on chalkboards?

The smooth side might, but for traditional chalkboards, I recommend the sturdier, tougher erasers. These would fall apart quicker on a chalkboard.

Can these be used as an everyday dry erase eraser (i.e. without adding water)? Or more designed for a thorough board cleaning (w/out using cleanser)?

I use them everyday without water. They clean the board perfectly and leave no smudges.

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3M Whiteboard Eraser for Whiteboards, 2-Pack, White/Blue (581-WBE), Rectangular foam Eraser

Product ID: 1566662

Details

Brand
Scotch
Color
White
Material
Foam
Product Dimensions
8.6"L x 7.6"W
Recommended Uses For Product
Writing

💧water-activated cleaning

🧼removes permanent marker

🧽2-pack foam erasers

HK$127

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Description

🧽 Clean boards, clear minds—erase the ordinary!

SPRAY FREE CLEANING - Eliminate the need for harsh chemicals—just add water!
DUAL PACK EFFICIENCY - Two premium foam erasers for uninterrupted productivity
COMPACT LIGHTWEIGHT - Portable 8.6" x 7.6" design fits perfectly in any workspace
PERMANENT MARKER SAVIOR - Effortlessly erase stubborn permanent marker stains
DUST FREE NON ABRASIVE - Protect your whiteboard surface while keeping it spotless

The 3M Whiteboard Eraser 2-Pack offers a dust-free, non-abrasive foam solution that cleans dry-erase and permanent marker stains using only water—no sprays needed. Compact and lightweight, these erasers keep your whiteboard pristine and your workspace professional.

Specifications

ASIN	B000MFHX3U
Additional Features	Dust Free, Non-Abrasive
Best Sellers Rank	#17,409 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #28 in Drawing Erasers
Brand Name	Scotch
Color	White
Customer Reviews	4.4 4.4 out of 5 stars (1,152)
Global Trade Identification Number	00021200467134
Item Dimensions L x W	8.6"L x 7.6"W
Item Shape	Rectangular
Item Weight	18.14 g
Manufacturer	3M
Material Type	Foam
Model Name	Whiteboard Eraser
Number of Pieces	2
Recommended Uses For Product	Writing
UPC	021200467134
Unit Count	2 Count
Warranty Description	No

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HK$127

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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