Iron cleaners do a great job in a lot less time than the salt and brown paper (which I have found doesn't work all that well, anyway). Rowenta sells one but it's the same stuff as the cheaper kind. They both work the same. Be sure to follow the instructions, though. You have to use it on a hot iron.
As far as the ironing board cover goes, My husband made me an oversize ironing board (plywood, batting, etc.) which I cover by pinning on a double layer of cheap muslin. When I get this cover all gunky from fusibles (or when the cat urinated on it) I throw it in the wash. If the gunky stuff doesn't come off, then I just use the back side, which is still clear. Then I can fold it inside out and get two more surfaces to use. A really cheap solution and I always have muslin on hand.