[Typo3] removing extension styles

[Roberts, Emma]

I have some styles linked to a couple of extensions appearing in my source
code which I want to get rid of. 

/* default styles for extension "tx_thmailformplus_pi1" */
/* default styles for extension "tx_dropdownsitemap_pi1" */

The thing is though that these extensions don't seem to be installed so I
can't delete them from the setup.

Any ideas?

Thanks,

Emma
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