I find pretty much all coffee stains vanish with just the normal dilution. If there are any deep looking coffee spillages or areas affected with flood water i.e. leaky ceiling, leak from a water machine etc. Then I'll go round with a spotting machine and thoroughly rinse out the stains that I think may wick back (I'm only talking about a few of the stains, not all spots!).
Then Encap the whole lot. Its probably not necessary but its a good safety measure that will prevent a call back, or worse yet them not calling you back at all, like ever!! and only takes 20 mins.