How do you get a slate clean?

When you forgive, you wipe someone's slate clean. like God wipes our slates clean when we ask him to forgive us. He will always do it. he does. he will forgive you of you sin;s

Soak it in dishwashing liquid and bleach every day before you use it. Slate cheeseboards arnt the best because they have to be washed well before use otherwise the cheese may carry a diesese. But if...

Cillit Bang, It work's realy well. Just leave it sat for 15 minutes

A wirebrush drill bit will work as a last resort. It is very tedious, very messy, and very time consuming - but it gets the job done.