First vacuum with an attachment to get off all dust.
Then consider TSP. Scrub with a brush with TSP. This is very strong. Wear gloves and safety goggles. Available at paint stores. It is a powder you xix in water. Used to prep surfaces for painting.
Would it be best to fill grout grooves with mortar like a week before just to assure even surface and again they have been painted also. Frankly do not know if it fo...
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Hi, did you intend to include a photo of your fireplace?
You could paint it or whitewash it:
http://www.bhg.com/decorating/fireplace/styles/how-to-paint-a-brick-fireplace/
https://www.younghouselove.com/2013/08/how-to-whitewash-brick/
To clarify...do you mean to POP off the stone or a POP of color?
You can paint it with chalk paint! Water it down a bit and then make sure to apply a good wax sealer.
Color is dull grout is dull
First vacuum with an attachment to get off all dust.
Then consider TSP. Scrub with a brush with TSP. This is very strong. Wear gloves and safety goggles. Available at paint stores. It is a powder you xix in water. Used to prep surfaces for painting.