Had you said this much earlier, I might not need to waste my time on this thread. And no, I never told OP to "don't even attempt to wash". Read again. I saw the picture, figured damping/construction materials already damaged beyond trying reuse it, thus I recommend replacing the pads. If they were like less than 6 months old and/or had much less wear, I would probably recommend clean them thoroughly and use them again. But we are talking about pads which is more than a year old, and was used in rather bad condition according to OP, with picture to inspect.
You were rather single-minded with your initial statement, jumping to the premature conclusion (which may or may not be wrong) that his pads were unusable in need of a replacement.
As for the OP, he should probably try washing them and then see afterwards if the sound is lacking, before deciding whether to replace them or not.