As I've said before, if you want to get rid of your blog, make it into a stub first. Once the search engines update their databases with the stub, then delete the stub.
If you don't, you could end up like Sir Richard Francis Burton
I have deleted the blog... at the painel configurations I selected
to exclude the blog...
Then, later I tried to enter at the site only for making sure.. but it
is still there!
In an earlier thread, Blogger Employee tells us
... there's a small bug in the old version of Blogger, which sometimes causes a hiccup in fully deleting an old blog.
The solution, in another case, is monolithic, starting with the usual observance
... we can't do anything w/o your blog's URL :)
and after the URL is provided, continuing (concluding?) with
Don't worry though, the content no longer appears online.