[product manual] This product is a special eraser for upper stains Because each dear shoe has different strengths to use The effect of wiping out is also different, some obvious and some not obvious Therefore, we cannot say for sure whether the product is good or bad. Usually the shoes are dirty, it is recommended to wipe with a wet wipe It is recommended to use this product if the shoes have difficult stain areas It belongs to special use items (there is also a certain wear on the upper) The material of each shoe is different (whether big or small shoes) Therefore, some materials are not compatible with the eraser, because the effect of wiping is different, and some even have no effect. This cannot be denied that the eraser has no effect ~ Test instructions: This little rubber when we are testing It takes a lot of repeated wiping to get a clear effect The overall effect is four stars