To extend the service life of any type of coffee machine, it is generally recommended to clean the appliance at least once every 1-2 weeks, though it depends on how often you use your coffee maker. With 2-way coffee makers, you will naturally need to double your efforts since both sides require regular cleaning. The cleaning process also depends on the types of brewers used in a dual coffee machine. Each type comes with its own sets of recommendations that vary depending on the brand. Following the manufacturer’s instructions, it is necessary to descale the water tank (or two separate tanks, if a coffee machine has independent water systems) at least twice a month, and those living in areas with hard water will have to double that number or purchase a stand-alone filtration system,  The side with the drip coffee brewer almost always uses mesh filters which should be cleaned with warm water and a soft brush. Single-serve brewers are a bit trickier in that regard. A classic single-serve brewer has a special needle used to pierce the top of the pre-measured pods, so this needle needs to be removed and cleaned along with the brewer’s water tank, drip tray, and other functional parts.