the sunroof drain pipes come the A pillar and exit just behind where the ecu is situated, same position on passenger side not sure where the rear ones exit from. give them a blast with the compressor, that should be good enough to clear them out.
If not that then where the bonnet hinges are there are pockets below and they sometimes get full up of leafs and rubbish which then flood into your car when raining. hope that can help you.
rears come out in the boot
