experience with Kroil?

went to vans and bought some Sunday afternoon and used it to clean my 22f class last night. It worked very well on cleaning all the old oil out of the bbl. Unfortunately I removed the bolt to clean it and found an unexpected surprise. The underside of the bolt was slightly rusted. I used the kroil on it and it took the most of it off but not everything so I'm soaking it now to see if it will remove the rest. Unfortunately I do not have a way to take pictures so I am not able to show before and after shots but I will let y'all know how it turns out.