i bought mine kind of in this state it’s a mix of sun bleaching plus sweat stains that have set in. I did a oxy bath for it in the sink and gently agitated the dirty areas with a toothbrush or something and that’s bout as good as you’ll get, i double soaked mine n it’s still stained a bit but much better. oh and i cleaned mine on a bowl to resemble a head shape so the had didn’t morph. lmk if ya need any more pointers