With 890 the issue wasn't liquids or food residue. It was down to button switches with were not designed to be nearly robust enough. Case in point most used controls, such as volume, always died first.\nThis is not to throw shade on all of their controllers, but I have URC's MX-850 remote for the last 10 years. I got it right after Harmony 890 died. It still works like new with zero issues.\n\n\n\nYes, I've had worn out buttons on 650s and a 700 too. If you're careful you can get this stuff and paint some conductivity back on the innards....just don't overdo it (ask me how I know :).