I've read the whole thread and am now fully informed about dishwasher cleaning and operation

but still a little vague about whether I should be doing something with the washing machine.
There are some mentions in this thread about vinegar and Durgol - should I be doing a vinegar/Durgol wash every couple of months, to flush out any calc in the system? I've looked at the commercial products that you're supposed to use every time, but they're 3x more expensive than the Migros budget powder I use!
And if I do a bi-monthly vinegar/ Durgol wash, presumably I run an empty cycle just after that, to stop the clothes smelling like a chip shop?
Thanks for any help.
kodokan