How do I clean to brick, previously darkened?

Hello Bea! There are products on the market to clean spot from your brick fireplace. However, a simple solution of water and household vinegar will do the trick. Click on the link below and scroll through the photos to see what a beautiful job it does:

https://www.apartmenttherapy.com/how-to-clean-a-brick-fireplace-with-all-natural-cleaners-apartment-therapy-tutorials-216668

coke a cola does the trick... try it on a couple & see what happens.. Good luck

http://www.howtocleanstuff.net/how-to-clean-a-brick-fireplace/

American Building Restoration Products has developed a waterless brick cleaning product that does an amazing job. Sherwin Williams carries it or if you are not close to a store you can e-mail abrp.com and they will Ship it. There is also a video that demonstrates it.

scrub with a brush- tsp, wear safety glasses.