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I've had similar with long extension cables but that was plugged in overnight charging some big lead acid batteries with multiple extension cords chained together. The bit that melted was by the bed :s (narrowboat so limited space or options for routing cables in an emergency).
Hopefully it's the extension lead at fault as that's much easier to replace!
If your mate has time then you could ask them to spur off (or even better if they can extend the ring) to have another socket closer to the machine so you aren't reliant on extensions.
This is pretty straightforward to DIY if you have the inclincation.
Cheers for that. Got a mate who’s an electrician coming to have a look. It was an extension cable that the dishwasher was plugged into. Been smelling the odd smell for quite a while and use the dishwasher once a day at least. Thankful nothing worse happened. Usually keep the recycling quite close.