. "Co-solvents (also sometimes referred to as ???coupling agents???) suitable for use in forming the micro-emulsions of the present invention comprise of n-butanol, iso-butanol, n-butoxyl propanol, ethers, di-propylene glycol, mono butyl ether, glycols including propylene glycol, ethylene glycol, butylene glycol, hexylene glycol, di-propylene glycol, di-ethylene glycol, tri-propylene glycol, triethyl" . . .