Skoda superb estate 2015 - one of the last MkII ones.

Have a rainwater leak, passenger side footwells sodden front and back. Drivers side is dry. I've cleared the drainage ports under the scuttle cover under the windscreen. These were partially blocked with leaf / tree debris, so I assumed that would take care of things. It hasn't - are there any other things to check that might be the cause of rainwater getting inside? Thanks for any advice.

Have you got a sunroof? They are very prone to leaking