Adhesive stuck on plywood

Q: I am removing a laminate floor that has 1/2 inch plywood underneath. I need to prepare the plywood to lay ceramic tiles down. I have removed most of the laminate flooring but the adhesive is still on the plywood. Is there a product that will remove this adhesive, or would it be a huge problem if I tile over it?

A: Laminates are generally not glued down. To lay ceramic or any other flooring, it’s best to have a smooth, sound surface to work on. Maybe you can rent a polisher/grinder with appropriate abrasives from a rent all store? Is the adhesive hard and brittle or does it still have tack to it?