Get the PH of your solution up to 12.5, use a PH pen.
Re-check your PH's. then add some naptha. warm the solution and naptha up to 140F, to increase it's soluable power. Naptha is sorta wimpy solvent. All solvents increase in power at a higher temp. mix it allot and let it seperate in a 140F bath.
But don't approach BP (boiling point) of substance once basefied! Use Heptane (bestine-rubber cement thinner) instead to pull some more out.
"Infinite Diversity, in Infinite Combinations."