This same thing happened to my white Christmas tree! Upon doing a bit of research, I found an article that may be of interest to both of us! I hope this helps!
Hi Elizabeth, here are a couple of sites that may help:
I don’t think you could it’s from the heat you can’t wash it it won’t work
Take your shop vac......put the nozzle blower to reverse.....and blow all the dust
out of it.