I use it everytime i wash my car, but i also use super resin polish every 1-2 months though. Its a good stop in, not as good as the resin polish - but good for the in-between times!
_________________________
Now in a 2009 PB Ford Focus RS!
I use this and don't like it! Every time I use it it leaves really bad streeks all over the car, no matter how hard I go over it with the micro fibre cloth.