Stairville Cleaning Fluid for Fog Machines - fog machines should be cleaned after every 60 hours of use. Instructions: use only in well ventilated areas or outdoors, take the tube out of the tank and put it inside the cleaning fluid bottle, heat up the fogger and release fog for 20 seconds, put the tube back in the fluid tank and release fog for another 20 seconds. Keep away from children. Protect eyes and skin. Made in Germany. Contents: 250ml