[CAUT] Bowing piano strings?

[Zeno Wood]

Anyone have any thoughts on bowing piano strings?  It's for the
contemporary music ensemble, can't remember the composer right now.
The piano strings would be sounded with string/horse hair held in both
hands and shoe-shined, kinda like dental floss.  The performers are
trying to figure out what material to use for this.  I think that
rosin is probably not too good for bass strings, what do you think?
Is there some kind of material that would have the necessary "grab" to
put the string into motion without rosin?

Thanks,
Zeno Wood
Brooklyn College