Step 1
If the spill is fresh, blot at the liquid with a clean, soft rag. If the stain you want to clean on your marble fireplace is dry, dust the surface of the marble with a dry, soft rag until it is free of any debris.
Step 2
Add a small squeeze of mild dish soap to your hot water. Dip your sponge in the hot water, soak it and wring out the excess. Wipe the stain, don't scrub at it, but wipe three or four times, blot dry with a clean rag and examine the marble fireplace to see if the stain is gone.
Step 3
For stubborn stains that resist cleaning with a damp sponge, use a specialty marble cleaning product. It does not matter which one, as long as the product has been specifically designed for marble; read the back warning labels closely to make sure that it is. Follow the instructions carefully, as most contain a mild abrasive that could harm the finish on your marble fireplace.
Step 4
Blot the entire marble fireplace dry with a clean rag. Uncap your marble sealant and pour a small amount on the stone. Using a clean rag, spread the sealant over the stone in a circular, polishing movement. Do this until the stone glistens but does not feel wet to the touch. Let the stones dry for at least 24 hours before using your marble fireplace.