how do i clean the inside tube where the hot water comes out on my grind and brew? it's got gross brown buildup.

Diagnosis

That's the brew head or shower head. Coffee oils and mineral scale accumulate there, affecting water distribution and taste.

How to Fix It

Use a vinegar soak and manual cleaning.

1. Unplug the machine and let it cool. Remove the coffee filter basket.
2. Fill a small cup or bowl with equal parts white vinegar and hot water.
3. Submerge the end of the brew head (the metal part with holes) in the vinegar solution. Use a rubber band to secure a plastic bag around it if needed to keep it immersed.
4. Let it soak for 30-60 minutes. The deposits will soften.
5. Use a soft toothbrush or pipe cleaner to gently scrub the holes and the exterior. Wipe clean with a damp cloth.
6. Run a water-only brew cycle (without coffee) to rinse any residual vinegar from the system.

If That Didn't Work

For heavy scale, use a dedicated coffee machine descaler (like Urnex) following its stronger solution instructions, which may involve running a full descale cycle through the machine.

Heads Up

Never use a pin or sharp metal object to poke the holes—you can damage the precise water dispersion pattern. The plastic housing around the metal shower head is delicate.