Just a note to let you know that you had a bit of luck.
There are two kinds of electrical contact cleaner.One leaves a fine coating as it dries and the other type dosen't.
Sounds like you got lucky. Its all good.
Now you didn't use sand paper of any kind which is also good because what they use to adheare the sand to the paper is a silicant product.When used it tends to leave a silicant film which is an insulator.