heres my 2 penneth worth, take it or leave it.
never cut corners on a job just cos you think its not dirty,
i always use the enviro dri. and i charge accordingly, even if the carpet isn't that dirty.
why?
1) it looks professional
2) thats the way i clean regardless
3) i charge for this so why would i not use it
4) it lifts the pile
5) next time you clean it, it may well be a lot dirtier and then you'll have to up the price, not the way i do things.
6) just cos it don't look dirty, doesn't mean it aint.
so i say, go round and do it properly. sorry james, love you