I have a theory - this theory what I have is to warm them up, gently,
with a hot air gun.
I've never tried this as I don't have that sort of gutters- but it is
something that often works with plastic fittings that tend to break..
Squeeze some 'el-cheapo' washing-up liquid between the clip and the gutter -
that should make it easier, and you can also use the same method for
refitting the damn things (even better, nip down to a plumbers merchant and
pick up a small pot of silicone grease for when you refit the gutter).
Beware though, as the plastic deteriorates with age and exposure to
sunlightlight, you could still break one or two of the clips
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