how to remove usernames in tweets

I am cleaning tweets but couldn't find how to remove these things:
@username, rt , \, and ....
second question is when i apply this code:

mycorpus <- tm_map(mycorpus, removeWords, stopwords('english'))

it doesn't exactly remove stop words, i still can see stopwords in wordcloud. How is it possible?
can anyone help?
thanks

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