Thanks
But you beat me to it - after 5 minutes of research on J's Racing's japanese website, I came up with this:

Because recycling is possible by doing the washing reproduction, our air cleaner filter has achieved a marvelous, long life. The K&N filter cleaner doesn't hurt the material. The performance at equal to the new article level revives by spreading special filter oil, and the ability of the filter is demonstrated by 100%. Of course, it is possible to use it also for other K&N filters.
..Gotta love online translators