Rinse quality is lower in modern washing machines in order to meet water economy standards - even if you buy an £800 Miele and turn on all the 'extra rinse' options.

I know this because I have a relative with sensitive skin, who resorts to rinsing things by hand after taking them out of the washing machine - and doing such a rinse visibly dirties the water. Feel free to test this yourself.

This has happened across the entire market - so much so that 'Which Reports' (UK consumer reports equivalent) have lowered their standard for 'five star rinse quality' as nothing on the market could meet it.