Linda, you have to click on the "spam" button on the comment section of your dashboard. Then delete them.
I had 12 new ones this morning. ( a new all-time one day high) They usually either read like goobedly-gook or have strange looking files attached. Sometimes they will say nice things about your blog, but they are still spam.
I don't know how the system identifies them as spam, but it does a very good job of identifying and correctly puttiing them in the spam folder. This allows you to review them before deleting them.
Yes, comments seem to be hard to come by. After more than a year, I have three legitimate comments. Two from members here.
Maybe in addition to linking our blogs, We should all exchange one nice comment to the others that are taking the time and effort to help each other with these links.