I ran 3 patches of Prolix through then 1 dry patch. Prolix removed almost all of the lead as it lubricated the barrel. It is some amazing stuff. Im surprised this hasn't been spoken about in the airgun community.
This is off the Prolix website.
PrOlix is a penetrating solvent that has been developed over many years, used in industry, and rated the safest, most effective agent. Based on citrus technology (it has a pleasant, mild smell in contrast to petroleum based solvents), it is biodegradable and ozone-safe.
We took the results of field testing and modified the solvent for firearm usage. The end result was improved effectiveness, while remaining non-abrasive and non-acidic. In short, it won't remove or harm your metal or wood finishes. We do recommend that you test on plastics, in a small area (on the back side). If no adverse action is noticed, you may continue with complete confidence. Another benefit of using PrOlix is that total disassembly is not required.
The solvent seeks out dirt, oils, grime, etc. (even in small and impossible areas) and floats it away. The chemical action during cleaning developes the DRY lubricant and it is drawn into the pores of the material, creating a skin of protection.