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and replace it in the quotes with something like "see original post for images"

Lots of images are posted on my forum and I want to stop the clutter/quotes containing the images.

Very much appreciated.

you can try using jQuery for above requirement.

find </body> at the bottom of showthread template of the theme

add before (in a new line)

<script type="text/javascript">
$('blockquote img').each(function () {
$(this).replaceWith('see original post for images');
});
</script>

save the template & check with quoted images

Edit [Dt. 2017 April 21] : see also modified code here