Recently a friend asked me if I would take a look at his Ruger revolver. He said it was working when he put it in the safe , but now it wasn't.
When I took it apart there was a lacquer like coating on all the parts. I soaked the parts in a pan of Kroil for 24 hours. The coating was still there.
Soaked it another 24 hours in 'Ed's Red'. Then had to use a brush, paper towels, cleaning patches and various tools to clean the gummy mess off each part.
I called him up and said, OMG what kind of oil did you use on that gun?? He told me Hoppe's oil. ( Never did find out the exact type / name)
I know Hoppe's makes several different lubs. etc. And I have used Hoppe's #9 forever and never had any problems. But this was the worse mess I have ever seen.

I've had good luck with Breakfree CLP. But, recently I've been using Kroil and Kroil oil.