Brewed coffee has a plastic or chemical taste, especially on a newer Oster coffee maker.

Initial cleaning:

• Before first use and if taste issues occur, run 2–3 full reservoirs of plain water through the machine.
• Then run a cycle with a 1:1 vinegar-water solution, followed by 2–3 rinse cycles with fresh water.

Component cleaning:

• Wash the reservoir, carafe, and brew basket with warm soapy water and rinse thoroughly.

Water quality:

• Use filtered or bottled water if your tap water has strong odors or tastes.

If the plastic taste persists after multiple cleanings, there may be an issue with the reservoir or internal tubing materials; contact Oster support for possible replacement.