It did an excellent job removing dried polyurethane foam from tile. Whatever could be removed from the top with a tool had already been taken off, and a thin yellow layer remained on the tile, which could not be removed by any simple means. We applied this, and wherever it made good contact, within 3 hours it had almost completely cleaned it. Ideally, a different brush than the one included was needed to reach some spots better. It seems to be the only cheap and widely available such product in Greece; there is a much more expensive professional one, but don't spend extra unless you try this one first.

It works but requires a lot of patience and effort. It produces a small film each time, so to properly remove a flaw, it needs to be applied 4 to 6 times and removed with a plastic spatula. I haven't found anything that does a similar job, so 4 stars.