We've had a couple of colour inkjet printers over the years both of which have died because we don't use them enough and they gum up the jets so don't print colours properly. About 18 months ago we bought another - Canon Pixma - and it's just starting to play up like the others. I've done all the cleaning options with a slight improvement but it's still not right. There's a wee asian computer shop near us who has offered to clean it out for us (don't know what he'll charge for this or even if it's worth trying to do this?) So I'm wondering, if he succeeds, friends are saying I should run a colour image through it once a week to keep it in good order (often we don't print anything for months). Anyone care to comment? should I do this? if so what image should I use, I imagine it needs to run all the colours so the image will be important? Also, when not in use I switch it off at the wall but another friend tells me I should leave it on all the time and this may be why I'm getting problems. He also said that switching it on a and off like this is very wasteful of ink? So, any advice, hints and tips regarding this will be most gratefully received.