I JUST broke down and bought a new green Olfa 24x36 last week at JoAnns on sale 40%off and with my 10% off as well) because after 20 years of constant daily use, my old blue Olfa was beyond responding to my usual cleanings. I have made about 100 purses with fusible fleece and the fleece fibers were really getting stuck in the mat. It was used to death even before I started making purses, so I am retiring it gracefully. I didn't know about soaking it in vinegar and water, so I will give it a try. In any case, If it is just too far gone, I can always use it for just a work mat because all the markings are still clear. BTW, I bought Joann's 32x58 white mat, and every cut shows. It ISN'T for rotary cutters!! And, it wasn't cheap! So disappointed! I have it under my new mat because I don't have any other place to store it!