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Try it, once it is flat at 60 grit.

Once flat you can quickly run up the grits up to 500, but if you want aggression 60 might do it for you.

Sharpen a couple kitchen knives and see what you get.

Lap it, you will take off 1/8 to ¼ inch depending on which side is the good side.

60 grit and steel cookie sheet on the floor with your body weight over the stone, add grit as it feels like it is...

I buy dollar store oven cleaner for cleaning stones, it will save you a lot of time and quickly remove thick crud.

For cleaning boxes, I spray down with WD40, it is a good crud cutting solvent....

Just take a small hammer and tap on the box, lite taps. Do not hit the stone. You will hear a different sound when the stone breaks loose. Then tap the other side. And it will pop out without damage....