H.K.
I don't know if you have the same problem as we do or not, but I have scrubbed until I am almost dead with no results. Recently my 3 yo daughter was on there and got off black from head to toe and I could barely scrub her clean afterward......We have come to the conclusion that we will just have to get another mat, and that it seems like this one is just old and wearing off like a rubber tire or something. I googled the mats and they cost a whopping 100.00 dollars (maybe a little less) but A new trampoline would cost a lot more, so we are going with the new mat idea. I wish you the best