If they are full of sodden leaves and smelly muck it s likely that your problem isn t so much a leaking gutter as a spillover.
Gutter elbow leaking.
Even the sturdiest materials can eventually develop small cracks or holes due to weathering making.
Apply silicone reassemble.
Upper elbow below the gutter leaking at seams and elbows due to damage from clogging and frost downspout leaks at vertical seams that have burst from swelling wet leaves or frost clogged lower elbows near the lower end of the downspout.
Using a small trowel a gutter scoop or your gloved hands clear.
Remove connecting hardware step 2.
Unless you regularly clean them out your gutters.
Clogs are one of the most common causes of leaky gutters.
Caulk sealants step 1.