Bests & Worsts Reviews from Amazon

Much like knife sharpening stones, do yourself a favor and heed the instructions. The key to this, knife sharpening stones, or sandpaper is to let the hard abrasive material do the work. Using great pressure will not get it done any faster, but will wear down the stone faster, and possibly break it. More passes, and avoiding extreme pressure is best. The mind tries to tell you that more pressure is needed. but actually it is not any better at cutting the stain with great pressure. People often wear out sandpaper quickly by applying too much force, as they also do with often expensive sharpening stones. This is the same. Pick a spot and use light to medium pressure until the stain starts coming off. Heavy pressure just wears out the stone as well as your arm. Almost all abrasives are like that. Great pressure also packs the removed material in between the grit in the stone making it less abrasive.