Need a bit of advice please.

My wife bought me a snow foam lance and foam for christmas, but no instructions !

Is this the right foam (cherry foam) ?
What is the best dillution ?
How long should I leave it on before washing off ?

I had a practice on my Fez and my sons focus, but did not get very good results ! ended up using a sponge and bucket, should it have removed all the grime from the fiesta ?

Kev

Pics below