constantine63

I use an old plastic credit card. Held at an angle across the mat, it works pretty well.

quilterpurpledog

A little steel wool works well also.

lindaschipper

I use a green Scotchbrite to remove mine. Scrub in both directions for the best cleaning.

ktbb

I ditto the comment that a dull blade may have helped cause this. It has been suggested that a mushroom brush is good for cleaning this out. Also - it appears that your mat is older and dried out a bit. Olfa suggests that you periodically soak your cutting mats in warm water and let them dry flat - this helps keep the mat moist. I do mine in the bathtub where they can lay almost totally flat. Do not put in direct sun to dry since that might cause warping.

redmadder

I use a damp washcloth, that does double duty of moisturizing the mat and pulls the batting right out.

HoneyJ

Ditto the comment about a gum eraser. Works pretty well.

maviskw

After reading this and HoneyJ's post, I took my really old eraser and worked on my mat. The batt marks are Gone! After scrubbing, I wiped over the spot with a damp cloth to remove eraser crumbs. I'm happy!

Sew Freak

It looks like you don't use the grid lines for cutting so why don't you use the backside for cutting your material. I do that to keep my grid lines nice for when I really need to use them. It helps.

Kitsie

I use an old matt saved for just that purpose, and cut on the diagonal to avoid the ruts.

lolagrace

A friend made little scratchy pads using tulle that she cut into strips then crocheted. I use it a lot to remove batting or fusible fleece that also likes to leave bits behind now and then.