cleaning up a wootz tulwar

[shastardhari]

Dear VIking sword forum,

I recently purchased a tulwar for £43, once i had it in my hands i noticed a pattern throughout the length of the blade, crystaline wootz?
i am currently cleaning it up with wd40 and fine wire wool...

some bits are very stubborn and will not come off the blade, can some suggest what else I can use to clean the blade up , and if i do use various grits of wet
and dry sandpaper how can I etch the pattern back?
here are some images of the tulwar attached