How to Clean a Keurig Coffee Maker — Toronto Home Guide

Single-serve coffee makers like the Keurig accumulate mineral scale in the internal water lines and mould in the reservoir — both affect flavour and machine lifespan. Weekly basic cleaning and monthly descaling keeps the machine running optimally.

Weekly Clean

1. Remove and wash the drip tray, drip tray cover, and water reservoir with warm soapy water — rinse thoroughly
2. Wipe the exterior with a damp cloth
3. Use a damp cloth or cotton swab to clean around the K-Cup holder and the puncture needle area — coffee grounds and oils accumulate here and can clog the needle
4. Run a water-only brew cycle (no K-Cup) to flush the internal lines — use the largest cup size setting

Needle Cleaning

A clogged exit needle is the most common cause of weak or incomplete brews:

1. Unplug the machine
2. Open the K-Cup holder and locate the exit needle (bottom of the holder) and entrance needle (inside the head when lifted)
3. Use a straightened paperclip or the Keurig needle-cleaning tool (usually included) to gently unclog both needles by inserting and moving in a circular motion
4. Run a water-only brew cycle to flush

Descaling (Monthly or When Prompted)

Mineral scale builds up in internal water lines from tap water — it insulates the heating element, slows brewing, and alters flavour.

1. Empty the water reservoir and remove any filter
2. Fill with 500ml of undiluted white vinegar (or use Keurig's descaling solution per package instructions)
3. Place a large mug on the drip tray
4. Run a brew cycle without a K-Cup, using the largest setting — repeat until "Add Water" is displayed
5. Let the machine sit for 30 minutes with it still on — this gives the vinegar time to break down scale
6. Fill the reservoir with fresh water and run at least 3 full brew cycles to rinse thoroughly — vinegar taste in coffee indicates insufficient rinsing

Tips

• Using filtered or bottled water reduces mineral build-up and extends the time between descaling
• Never leave water sitting in the reservoir for more than a couple of days — empty and refill with fresh water
• Descale every 3–6 months with filtered water; every 1–2 months with hard tap water