I can recommend HPL’s very own CLP. Tried it last night after putting a few hundred rounds through my H&K .40. It cleaned the bore well.
For the modest cost of a CLP, or gun oil, I would go with a professionally formulated product.
You don’t use gallons of the stuff on an annual basis, just a few ounces, even if you’re a frequent shooter. I shoot at least monthly, often more. I spend thousands every year in ammo alone.
So, in that context, what’s $5 extra on specifically formulated products? It’s nothing.
That said, I really don’t like the “snake oil” like Frog Lube or Fire Clean. Heavily marketed crap needs to be heavily marketed because it is crap.
Three of my neighbors are SEALs. One was awarded the Navy Cross.
None of them like Frog Lube.
Back on topic: just buy and use a good product. Yeah, they cost a couple bucks more than leftover motor oil, but they work better and that cost is truly insignificant in the context of what I spend on guns and ammo.