How I can remove extra theme URL from Google Cache?

I want to ask a question related to word press theme related. My question is that if I launch any website and forget to remove extra theme URL so what should I do that time? If I delete all that pages which is useless so that already in google cached so it will show on next crawl 404 how I can fix this error or remove this pages from website?


Dubai Web Developer


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301 redirect from .htaccess so it will be clear to google after few days