Ok so ive had this "special " stone in my possession at least 35 yrs. ive really never used it. didnt have a need really. it was my grandfather's, and i had no idea what it was until i came here to B n B lol. now i need to hone my razors and low ans behold what do i see on my shelf? well i already own one of these fancy vintage coticule thingies!!! lol. i would love some advice on how to clean the old swarf off of it and what i should use to flatten it. any info you guys could give a green newbie would be really appreciated.