I Can't Find "Soap Flakes"--What do I use as the final step in my rock tumbler?

Here's a rock tumbling tip:

Use a bar of Ivory soap as your final burnish, but shred it with a cheese grater first.

Many name brand laundry detergents are harsh enough to remove the polish. Some generic brand detergents have been used successfully, but on a trial and error basis.

Happy Rock Tumbling!