Removing adhesive from the back of those stick on tiles

[Alexis]

And the tiles themselves.  Seemed like a good idea a few years ago but now I want to rip them up, sand the floor, waterproof it and be trendy.  There aren't many, thank goodness, just a smallish bathroom.

Actually, the ones I ripped up yesterday had the most dispiriting floor underneath so might end up re-laying them......