If I stand in the kitchen looking at the wall, we have the dishwasher in the right corner. The drain pipe slopes down to far left corner and joins the drop from upstairs then on outside. In the middle of the run, the kitchen sink drain (one of those U traps with a connection on the side for the washing machine drain hose) tees into it.
For a couple of weeks now we've had the musty smell of drains in the kitchen that started off very slight and has got progressively worse, but after emptying out the under-sink cupboard there was no sign of any leaks anywhere and everything, both the cupboard itself and everything in it, was dry.
Last night though, I actually heard a trickle of water. Seems that the downstream side of the sink tee-in has gradually been coming loose and has finally come off.
Pipework has now been sorted but we now have a puddle of stagnant, dirty, smelly drain water under the sink unit. I'm assuming that this will dry up in time (concrete floor) but what can I do to get rid of the smell, both now while the water is still there and after it's dried if it's still smelly then?
I really, REALLY do NOT want to have to take out the unit for this, it'd be a major job and I can't bear to think of doing it to tackle a bit of dirty water.
TIA