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 connector leaking.
Remove connecting hardware step 2.
How to repair a leaking gutter joint.
Household gutter systems are prone to leakage caused by separated or leaking gutter downspouts.
The seal in a pvc guttering joint is made when the gutter is clipped into place.
The clips on the fitting and on each fascia bracket along the length of the gutter apply a downwards force pushing the gutter down onto the rubber seal that is located within the fitting.
Clean the joints replace the gaskets step 3.
Caulk sealants step 1.
This downwards force compresses the seal creating a watertight seal.