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disconnect the plumbing for the two appliances, run the kitchen tap to flush through, any better?
if yes, then it may be one of the appliances has a faulty non-return valve and you're getting cleaning agent backflow
if no, disassemble pipework and look for plumbing residues - was it soldered or compression/push fit?
rive_gauche
New house, new plumbing. Water tastes like tcp when drawn from kitchen tap.
Plastic hoses for washing machine and dishwasher run off from pipes just before the tap.
What is more likely to be the problem? The tap or the hoses?