mgmartino wrote:
I have had many Macbook Pros over the years. and the Fact that the 2021 model looks so bad is mostly due to the cheaper plastic and flatter keys. The cheaper plastic also makes them harder to clean with alcohol wipes or other computer keyboard cleaning products.
Comparing experiences, my 2019 MacBook Pro (16") looks pristine, like the image you posted of your 2015 model. That said, maybe 2019 models still were produced with "better" keyboards? I also have been using a 2023 M3 Max MacBook Pro, and its keyboard looks new as well. So possibly in between those years, 2021, a different quality keyboard was used?
We have strictly avoided any food near any of our Macs (actually my wife violates that rule sometimes and I can tell by glancing at her iMac's keyboard).
What for you to do going forward? Apple has some instructions for cleaning its laptops, but I did not find clear guidance in them for the keyboard, it seemed to focus more on the screen.
I think an Apple Authorized Service Provider (not Apple Store -- AASP are independent shops certified by Apple) can probably do a cleaning for a low nominal charge. In 2021 I had an AASP replace the SSD and battery in our 2013 MacBook Air. It is still running well. When we picked up the laptop after that service, they had fully cleaned everything and it all looked brand new (including the keyboard). I don't know how they did that but my daughter had used that laptop all through college and it looked very "used" but after the AASP cleaned it, it looked as if new. That might be an option for you (the cleaning part), but if the keyboard is prone to discoloration, it might return over time.
How to clean your Apple products - Apple Support (my guess is that you have already tried this on the keyboard)