All right, thanks. The plushes have no instructions, in any language about how to remove a bunch of dust stuck onto it. (I also need to remove some adhesive residue, since I velcroed Blaziken to the back of the car to keep it from getting bounced around the back seats and potentially flying out a window.)
I suppose the dust has gotten deep into Blaziken, as it's gotten discolored in some areas. I should just do the same for all of my plushes, since I have a bunch of them. (And find that Shadow Lugia plush, which has gone missing.)