I've gotten inside, it's FILTHY. I vaccumed out all the dust and particles. I took off this layer, its the rubber strip between the part where the bottoms of the keys and circuits meet, there is a lot of grime and c**p I cleaned off. Can I use alcohol? Damp rag? I need something moist to get it perfectly clean, not sure what to use thats safe.
I ended up using an incredibly mild rag I used to clean the top, which had a tiny bit of windex on it to clean. I went over the rubber slip piece between where the keys and the circuit board meet. It had dust and little ashy little pieces on it. Used some air in a can and put everything back together, it works like 100% new! Rock on