I wonder how sensitive MiniDisc is to dust because it looks like you can't stop it. Even new discs that I keep neatly in the box get some dust particles in the case over time. I then try to wipe them off with a cotton tip. With older discs I see that even speckles can stick to it that cannot be wiped off. Can the laser then simply read the information from the MD? So my question is how bad is it to have some small dust particles on the surface? and what is the best method for cleaning them?