Help! I have tried to remove some black cork tile adhesive by using an abrasive attachment on a drill. Now I have some scratchs and uneven dark/light patches on the tiles. Previoulsy I removed the bulk of the adhesivee by softening with white spirits and scrapping with a wall paper scrapper. This took approximately two weeks thus the use of the drill for the final clean! Does any one have any advise as to how I can restore the tiles please?!