make my grimey collars white

[9BeetrootsDancing]

White collar rugby shirts, grimed in with mud - how can I make them white again?

napisan?
take them off and restitch the wrong way out?

Soak them in Biotex?

no way am i taking them off and they are grimey both sides anyway!!!

They are soaking in vanish at the moment but still grey

hjduheryfcbao

Ace laundry bleach is brilliant for mud,grass,food etc.

Pour a bit directly onto the stain and wash straight away.

Its loads better than vanish