Any home or business that has a wood burning fireplace or a gas log unit has soot on the chimney. A stone or rock fireplace will sooner or later begin to look dingy, from the soot buildup. Cleaning the soot before it gets to bad, can be done in minutes.
You can use any household cleaner mixed as this: 2oz of the cleaner in a gallon of water.
If you have a porous or brick fireplace it is best to wet it with the hose first. This prevents the cleaner from settling into the pores.
Take a sponge and dip it into your bucket letting the solution to soak in. After that wring the sponge out over your bucket. Begin to scrub your soot areas until they are gone. Use a clean sponge to rinse the cleaner off your fireplace.
Let your fireplace dry for a few hours, and if needed reapply the cleaning process and drying process until clean.
For a great fireplace soot and dirt remover I recommend this product.