Heavy growth can block outlets
Loose moss finds its way into gutters and valleys.
Pressure washing can be too aggressive
It may force water beneath laps and damage weathered tile surfaces.
Clean for a reason
If drainage is repeatedly obstructed, controlled removal makes sense. Appearance alone is a weak reason for harsh cleaning.
Ready to get the fault inspected?
Send a wide photograph from safe ground if you have one. Close-ups are useful only when the position on the roof is clear.
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