must've been too much pressure!
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Hair-dryer/heat-gun will not harm the paint, eucalyptus oil will dissolve the glue.
Following all this advice (apart from the belt sander/grinder advice :D) I have successfully got them off with a heat gun (hair dryer seemed a bit girly) and some white spirits.
Too hot, and they strung like cheese. Too cold and they would tear. But get it just right - and they come off quite easily.
Looks 100% better, I reckon.
I was thinking 80's, but maybe bogan :p
Ford and Nissan seemed to specialise in these rather tasteless (to me) decals.