I've had problems with my 1990 xsi leaking in heavy rain. the water drips down on to the floor by the pedals and on the front passenger side in the top left corner (where the heater fan is) I've tried using water repelling sealant all round the windscreen and around the heater ducts but it still comes in and soaks my floor every time a significant amount of rain falls. Does anyone know if theres something I can do without resealing the windscreen properly?