Glue discolored fabric, how to clean it?

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I have tried Folex and able to clean stains and dirt on the chair fabric but not the discolored piping. The pipings are still brown. I believe it is the glue that changed the color, like I have seen on some of my sneakers made in China.
Anyone has success to get rid of the old glue and restore the fabric color? If not how do I dye/color just the piping or the whole chair? I have four chairs to work on.
q glue discolored fabric how to clean it, cleaning tips, reupholster
q glue discolored fabric how to clean it, cleaning tips, reupholster
q glue discolored fabric how to clean it, cleaning tips, reupholster
q glue discolored fabric how to clean it, cleaning tips, reupholster
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