Mr coffee problems
You didn't indicate a specific model. So, I'm going to assume yours is relatively the same as my JWX27.
Let me start by clarifying what the red light indicates.
A solid red light indicates the cleaning cycle is in progress. A blinking red light indicates the coffeemaker is off, but due to be cleaned. When the coffeemaker is due to be cleaned, the red light will continue to blink while the coffeemaker is off until the cleaning cycle has been completed fully. The entire cleaning process takes about an hour and a half. And, it is not intuitive. So, here are my instructions.
With the coffeemaker off (with the red light blinking), pour four cups of pure white vinegar (no water added) into the reservoir. Don't short the amount. You'll need four cups to complete the cycle. Remove any filters, but leave the strainer basket in place. Tap the "select" button three times until the red light is on (and stays on, not blinking). The cleaning cycle now begins. It should take between 45 minutes and an hour to complete. Don't be concerned about the 30-minute long pause during the cycle when nothing happens. This is intentional and part of the cycle.
After the cleaning cycle has completed, get rid of the vinegar. Rinse out the strainer basket and the coffee pot. Run a full pot of clean water thru a regular brew cycle (with the pot and basket in place, of course). Then, dump the water, rinse the pot and basket again, and run another full pot of clean water thru a regular brew cycle. Dump that water too. And, you're done!