For grunge, mineral spirits or Coleman fuel works as good as any high priced spread. Otherwise, any quality full synthetic motor oil is the same great cleaner/lube as in the highest priced spezial gun oil, at less than 10% the price per oz. Hype costs a lot of money. Ignore the hype and you are good to go with the best function in hand at a reasonable cost. Just get a squeeze/dropper bottle at the Dollar Store for convienient use.
There is nothing in synthetic motor oil that would diminish it's effectiveness for cleaning and lubing. There is nothing whatever spezial about $300 per gallon gun oil that will make it in any way better for cleaning and lubing guns or fishing reels. The little 4oz bottle it comes in is worth as much as the oil inside. It's called marketing folks, and it works very well for generating huge margins for the repackagers. The only thing spezial about it is the custom graphics on the bottle.