Had exactly the same problem with my clio hazard switch. If I turned the switch on I could not turn it off again. I think the button mechanism failed. You may be able to to take the fuse out but be careful not to disable the operation of other lights in the process (the hazard fuse may be linked to others). Like you I tried the WD40 thing without much success.. Luckily a week or so after the problem ocurred I got hold of another hazard switch from the scrappy for a tenner which solved the problem.
Take apart the switch and you will find a small alloy lever which is suposed to follow the chicaine moulded in the plastic. This alloy is too thin and over time bends with the pressure of the spring trying to push the button on, so when you release it will not relatch. Bend the alloy with spigot a little so it engages in the chicaine and your switch will work. My local man changes 1 every month, if the alloy were just a bit thicker there would never be a problem, it is hardly ever used so why should it fail, probably made that way.
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