Should I try to persuade my manager that code tidying should take priority over meeting deadlines?
I do not agree that this question should have been closed. If it was truly a duplicate, than the answers would have been the same. As it is, the answers are not the same.
"Should I" is not the same as "How can I".
There were several good reasons to keep the question open in comments, however those comments were deleted.
Sometimes I absolutely despair for this site when good content is mercilessly closed like this. Eric Lippert took the time to write an absolute gem of wisdom, it's such a huge shame that it'll go almost entirely unnoticed now due to over zealous moderation :(
community moderation
that originally closed your question, not the moderators themselves. Granted, some mods like Yannis are looking for an excuse to suspend someone (that's a joke, btw), but by and large the mods are pretty even-handed in their handling of things.