My dc have sole use of a bathroom as I have an ensuite. I do enforce regular cleaning of it but it has come to light that the sink is completely blocked. Water isn't draining at all. I have used soda and vinegar to no avail, though loads of delightful black bits are now swimming about in the water. I've also used hot water and washing up liquid, with the same result.
Any other recommendations? I've bought fairly expensive products in the past that have done nothing for less serious cases than this and have always had success with the above, but have obviously acted on past cases a lot sooner!
Help - please!