For most users, plain old mineral spirits is good for general cleaning, including bores. Any light machine oil, even 3-in-1, is OK for lubrication. Some believe synthetic motor oil is an excellent all-temperature gun lubricant, and I wouldn't doubt there's truth in that. I have even used watch and clock oil, and it seems fine also, even though you are not likely to have any on your workshop shelf. STP is a great lubricant, but a little messy. It works very well as a case resizing lubricant, the only one I have ever used for the last 45 years.