How did Zachariah find Dean?

The angeli can't use their own "angel-magic" to find the brothers, but that doesn't mean they can't use the good, old, HUMAN fashion way. Zachariah told Dean, in the car, that they had been using human informants, they had been making inspiration of buisness with Christian groups, and giving them Dean's image so the groups could keep an eye out. And the bible-freak (as Dean put him) outside the motel had dato Dean up to the angels.

Dean asked Zachariah this same thing and Zachariah detto they had to enlist religious humans of the più "extremist" type to help look for him. Right away Dean remembered the strada, via preacher outside his hotel who asked him "Have te taken time out to consider God's plan for you?" To which Dean replied "Too freaking much pal.". So obviously angeli had asked these humans to keep an eye out for Dean and segnala back his location.

some guy on the strada, via told zaceria

deansold his sole to the devil witch atomaticlly takes all protection away. if sam could fight for
himmself we wouldnt have to worry.