1/2 teaspoon of citric acid, 2 tablespoons of purple power degreaser to every gallon of water. What used to take 1.5-2 hours now takes 45 minutes.

If the brass will sit a while I'll throw it in a vibratory polisher with walnut shells and a teaspoon of Flitz. Just make sure you re-rinse before use to remove any traces of walnut shells.

Stop throwing money away on Lemi-Shine. Nothing but citric acid and some perfume.