leak on clio mk 2?

i think theres a leak on my clio mk 2 theres a puddle in the footwell but nt sure where it has cme frm as i hav checked all the window seals an all round the inside of the car is dry except for the footwell no idea where its cumin frm as there are no holes or rust patches where it can get in any1 no where it may be cummin frm