Most keyboards can be cleaned by popping off the keys (using a prying motion; this won't break the keyboard as they have a pop-in and lock system). If you don't have a can of compressed air, you can use a cotton swab or a clean napkin. However, this is a school keyboard and you may have to ask for permission to do so (you will be denied permission, of course, because this looks like vandalism). If you choose to do it and try to not get caught, just do it one key at a time (which is how keyboards get their layout messed up — kids messing it up).
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When I learned to type, I learned on the old model M keyboards which are still amazing if you can find one. Actually the teacher took some construction paper and covered the keys so we typed on the paper. That wasn't easy, but I did it as well as anyone else in the class. Either way, I think that most keyboards are standardized based on the old 101 key layout. I think that the only thing that really changes is how big the backspace key is, how big the enter key is, and the function keys at the bottom.