Equal parts acetone, Dexron, mineral spirits and Kerosene. Optionally, some lanolin. I've never used the lanolin. I used ER for years, but have slowly reduced the "formula" to where I just use mineral spirits for cleaning anymore (and WipeOut for other bore cleaning). ER might be a tiny bit better, but straight mineral spirits does about as well. If you want lubricative / preservative properties, anything you apply after the fact is bound to be better than ER.