If you’re good at what you do and confident you can do it well, you can just tell people how you work and they can take it or leave it.

Like Steve Albini did for Nirvana:

… you might find yourselves in the position of being temporarily indulged by the record company, only to have them yank the chain at some point (hassling you to rework songs/sequences/production, calling-in hired guns to “sweeten” your record, turning the whole thing over to some remix jockey, whatever…) then you’re in for a bummer and I want no part of it. 

I’m only interested in working on records that legitimately reflect the band’s own perception of their music and existence. If you will commit yourselves to that as a tenet of the recording methodology, then I will bust my ass for you. I’ll work circles around you. I’ll rap your head with a ratchet…

I don’t think you’ll find a more clear spoken proposal.