as scatteredleaves said: I wet my hair every day but wash them only once a week, that said...if they get dirty before hand ill just wash them, just be careful while washing not to undo knots...they probably feel like there coming un done a little afterward but they'll be fine.
So that's it? I just...leave it. Wash it when it needs it {what 'bout shampoo?} and after x amount of time BAM! dreadlocks!