Old poop stains...remedy anyone?

does anybody have any miracle treatment for old stains on nappies?

i have bought some used nappies that have a few stains on them...not bad, but would like to get rid of them if possible.
i have tried vanish, sun and lemon juice so anymore suggestions welcome please?

thank you!

Hang them out on a washing line on a sunny day. The sunshine will bleach the stains. If you don't have an outside line, stick them on a windowsill where lots of sunlight comes in. Leave them for a while and they stains will go

WSS, sunshine will eventually work it's magic...

Yep, it may take a couple of days but the sun should work eventually. If it's a hot day, keep the nappies damp (use a spray bottle, or just wet them under the tap), I think that helps (?).

i think soda crystals in with your detergent really helps - I used them for the first time on Friday and roibos tea stained wipes are looking white again (1kg bags are 39p in home bargains at the moment). I am probably going to use them every couple of weeks.

thank you for the replies....
the nappies have been out on the line 3 days now(rain and shine) so im just going to see what happens. as for the soda crystals...i have a home bargains near me and will buy some soda crystals to try out!