Napisan
Soak in Vanish for a few hours & a normal wash should do the trick 🫶🏻
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@Shore second this but be careful as it can fade away some fabrics
Napisan
I just fill sink with cold water and put washing up liquid on the stain (sooner the better) then pop in the wash machine.
For poo stains, just washing up liquid. Rub it in directly. Make sure you're using the right amount of detergent for your load size, machine size, water hardness and soiling level.
I often soak things in napisan for a while before putting through the wash. However I would say the best thing is hanging the washed garments in the sunlight- it disappears!