Table tennis racket on the old rubber and how to expose a clean sponge?

My colleagues asked me to give a finished leather for making rubber and foam, but I tried it, finished shooting the rubber and sponge attached to the base plate is very strong, tear fixed, so great strength, and also broken into a piece of sponge, There are remnant on the bottom shot, if a knife blade, it is easy to spoil the end of auction. Really do not know how to handle, there is no trick. Please heroes who enlighten.

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you can with vinegar, can also be used under the water will look, and then press dry film sets

best to get some new ones, but you definitely want to own it, try pour point try vinegar it