You could (and I have) take some Canola, some methanol (eg heet - I've used anhydrous ethanol before), some caustic, and manufacture RME (Rapeseed Methyl Ester)...google biodiesel soda bottle...AutoRx patent is lanolin, esterised with various alcohols.
Which will be an ester, with very high solvency....in fact changing to high levels of biodiesel in an older fuel system can stir up all sorts of junk.
I've added it to engines for the last 1,000km of an oil change, and had remarkably similar results to my runs of AutoRx...pretty much nothing noticeable.
Oil would need to be thick enough to handle the thinner solvent.