Cleaning pool saftey cover holes.

I love to use wd-40 for many projects around the house I carry a bottle anywhere u never know when u need some extra help. For me one of my projects is just with my maintenance. I have an inground pool with a saftey pool cover. There are bolts that are in the cement. I use wd-40 to keep the threads smooth with wd-40 and clean to help screwing and unscrewing the bolts and to protect the threads from any sand or dirt. This product works so well. With getting a rusty bolt off to protecting something. This is my project using wd-40. Its there to fix any emerging need.