TSA has a fun app with a “can I bring?” section. I have it bookmarked in my Travel folder on my phone.
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As for spray starch, I don’t know. Ironing to that degree while away, though... that’s a whole other level. If it’s for a fancy meal, I’d look up how to keep things unwrinkled when packing (something about rolling and using dry cleaning bags) OR find a dry cleaner if it’s for work.