I would use the Search Regex plugin. It will allow you to use a regular expression to find and replace (in your case delete) inline styles. Make sure you backup your database before you begin!
A simple regular expression that should work for you would be
(style=").*"
It will look for a string starting with style="
and containing any number of characters until it hits another double quote "
. (That would be an inline style applied to an HTML element). You’ll “replace” it with an empty value (to delete it).
You can also test your content / regular expression with Regexr to ensure the one I gave you will work.
Backup your database before you begin. If something goes wrong you can restore it. It looks like this plugin will allow you to Search (as a test) before you run a Replace & Save.
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