Had a bit of a discovery on the weekend!
Had to soak the little mans clothes as he got strawberry juice all over them (8 months old, learning to eat)
Got out a bucket and put the Napisan in, soaked it etc to get the stains out.
I also chucked in about 20 old Pro V's I had in my bag, they all had seen a round or 2, mainly dis-coloured more than anything else, the odd nick and scuff from normal use. Some hadn't been cleaned and had dirt and grass stuck on them, pretty filthy overall.
After a few hours they looked much mcuh whiter, and now will see a few more rounds instead of going in the practice bag!
Seemed to work better on V1x's for some reason also