To remove or delete spams from your blog, go to
Comments section of the wordpress administration page. Delete all comments that you think a spam.
To protect your website against spam comments, i recommend you to install a spam protection plugin like
akismet, anti-spam, or the likes.
I also recommend not to show submitted comments automatically as this will give idea to spammers that your website is not moderated.
Instead, go to
Settings > Discussion and check the
"Comment author must have a previously approved comment" checkbox under
"Before a comment appears".