OK so helped a mate today take out his old washing machine and put new one in. The waste hose from the machine just bends round and sits in the plastic waste pipe that leads to u bend under sink.
Into this pipe, further down, is the waste hose from the dishwasher.
Install new machine, test it and the waste water comes spewing back up the pipe so me being me, decides that we might as well take apart all the pipework and check for blockages.
I found lots of gunge and I also discovered that the waste hose from the dishwasher had went right down into the plastic waste pipe under the sink and was effectively acting as a blockage.
So took it all apart, cleaned all the pipes out and put back together and fired up the washing machine.
On the first rinse and drain, foam started appearing. From the top of the washing machine drain pipe. Then from the top of the dishwasher drain pipe. Then coming up through the plughole in the sink!
It was only after a lot of head scratching that my mate pointed out that I had used almost half a bottle of the Fairy liquid to clean the pipework out.!!
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