Bleach bit is good. But you mention emails. Emails are tricky. I have Yahoo I use and they host my business account. They keep records of emails forever. So emails really depend on who your account is listed with.
I don’t want to wipe the whole hard drive just individual items.
I should have predicted the “Hillary” onslaught... I am not Hillary nor John Podesta, nor a Russian bot!)
Some when we “permanently” delete....They aren’t really gone, gone?