Funnily enough I snow foamed Cherie's Fiesta ST today and mucked about to see how much foam I could get on it.. (hence the over-spray everywhere

)
..using
>Magifoam snow foam mix< and
>cleanyourcars lance<
I left it dwelling for at least half an hour - it stayed stuck pretty well before I rinsed it off - hardly needed a shampoo after to be honest, but I did anyway etc etc..