Washed the Z today using Chemical Guys Citruswash + Gloss. I used 1/2 of a plastic tea spoon in my quart Gilmore foamer. I was shocked at the amount of foam that stuff makes. Foaming and washing I used 1 1/2 plastic teaspoons out of my gallon jug of Citruswash + Gloss. Washing the Z every week the Citruswash may last longer than the Z.