Cleaning pillow that had sweat stains on it white again

I have a pillow that is now starting to turn tan with my sons sweat from sleeping.always been line that from the beginning.I have all these stain removers.I just want to wash it once and and be white again.just like when he was younger.( He's now22)things just aren't as good as they used to be.if you know what I mean things just don't seem to be as good, work as well, do what they did before.I just want to get white whites again like they were when the clothes were used tho do it,granny used to do it.I just don't get it.they used tho take dirty stained shirts n sock's under garmets,j what not! day all I asking how to get em done line those before me?! Help please!
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