Originally Posted by
littlebitoheaven
I have had this problem and found that an eraser does the trick. I found a very large (pink) eraser at the dollar store, approximately 4" x 2", which I will only use to clean my mats.
That's exactly what I was going to mention. I think its possible the gummy crumbly type erasers might do the best, but almost any eraser should work.
There's a product from a Canadian Company called Jonny Seww that does this. I have one of their blocks, I think it works better than an eraser, but the eraser is cheaper.
http://www.jonnyseww.com/cleaning_block.html - no real picture of it though. If get into the sewing room, and off this computer at any point today, I'll try to shoot a pic of it.