Is it on asphalt or concrete ? Is the paint latex , rubber or oil base? are the lines in good shape or do they have 6 or 7 coats of paint?
you can wet sandblast , or hot water hi-pressure may take it up.
on 4 inch striping about $1 per lft. on 6 inch striping $1.25 per lft. if you dont need to use the sand $1 per min or $60 per hr.
Mel
melsmobile.com