Dilute with water to make a 1 to 5% solution – depending on the condition of parts being cleaned. For instance, a 2.5 liter container of tec clean A4 concentrate makes approximately 15 gallons of cleaning solution. Mildly alkaline, it causes contaminants to dislodge from surfaces being cleaned. Grease, oil and wax float to the top of the solution where they can be skimmed off for disposal. This enables the ultrasonic degreaser to be used over multiple cleaning cycles, the number depending on the amount of contaminants being removed. Because it is water based, tec clean A4 is biodegradable, but please observe local regulations regarding proper disposal of spent solutions.