I need to lay lanolium in the laundry room. I had to tear up the carpet. Do I need to sc off the foam?

My water heater broke and spilled all over the wood floor (with the foam and carpet on top). I had to remove the foam and carpet, but a thin (not too thin) layer of foam is still stuck to the floor. Should I try to sc off all the foam before laying the self-adhesive lanolium on the wood floor, or can I just lay the lanolium on top of the thin layer of foam?