Cleaning Brick

Our power was out for four days a few years ago and we lived in the livingroom using our fireplace. It's a regular fireplace but we use gas logs. We have never been able to get all the bricks clean since then. We used muriatic acid as directed and some came clean but not all. The bricks directly above the fireplace opening are still sooty looking. Thanks for any suggestions.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.