Coffee makers, storage containers, and bean grinders will all collect residue and mineral buildup over time, so it's EXTREMELY important that you keep them clean. You can buy specialty cleaners for coffee makers or simply use vinegar; then complete a full brewing cycle using this solution only. Rinse everything thoroughly afterward before you make your next batch of coffee. This routine should be done at least monthly, depending on how often you use your equipment — which, if you're reading this article, we're guessing is pretty often!