[Retlaw]

Originally Posted by mick

If i can read the first post right he has water in the bathroom or failing that there is plenty of white stuff outside
oh and i presume they have neighbours

Trouble is he doesn't say what the pipe does.
is it a waste pipe or the incoming supply.
if its a waste pipe and you can access above it,
tip some caustic soda in, it will react with any grease or soapy residue and it will generate heat.
Did that with the bathroom sink outflow.
Retlaw