I have never cleaned my wheelie bin. Normally this is fine. When the bin is emptied (every 3 weeks) there's normally a bit of dust residue but that's it. I've had the bin emptied this morning, and when I've looked in the bottom, there's a fuzzy mould layer at the bottom. At some point in the last couple of weeks I've emptied the vacuum cleaner directly into the bin, so there's a load of dog hair stuck to it too.
What do I need to do? Is it just a case of swilling it out with the hosepipe to dislodge the mould and then put some bleach or something in it for a few hours and rinse it out?