Best hair whitening products please...

I have something called dung away which I use on really grotty bits that her usual shampoo just isn't up to - works well! Any remaining yellowishness is dusted with talc when dry just to take it totally away!
 
I use one of the spray sock whiteners. It needs to have a blue/purple tint to it to work well. Then while the area is slightly damp but not wet rub the chalk in (it has a very mild bleaching effect). Then brush out the excess when dry.
 
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