Im new to the forums as well as digital pianos. I just bought myself a very used Roland RD-300. There are a few problems with it, some sticky keys, and one key has been working on and off (but hey, I bought the thing for $200). Does anyone have any easy things that I could do to increase the performance of the keyboard? I was thinking of opening up the case and using some compressed air to get rid of the dust, and then using alcohol and qtips to get rid of any unsightly gunk. If anyone has any better suggestions, or a better product to clean, please let me know. Thanks!