I would be somewhat interested to see this question answered but as it is now I doubt it. It's really terrible.
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Flag it for moderator attention, and leave a comment saying that it needs editing.
There's been a request for a spelling and grammar flag, but it's not accepted yet. It's not declined, either, though.
But for now the official thing to do in this situation is to flag it for moderator attention.
Edit it and make it better! As of a few months ago, all users can edit questions. Users with <2k rep need to have their edits approved by users who do have edit privileges before the changes show up, though. On SO, two approvers are needed; on other sites, only one.
If you have enough rep to edit a CW post, go ahead and edit it.
If you have enough rep to edit a regular post, go ahead and edit it.
If you do not have enough rep to edit the post, flag it for moderator attention or leave a comment so that hopefully some others high rep users can take the time to clean it up.