Long ago we had a brick chimney that ran inside the plaster walls. My brother burned a lot in winters but never cleaned the chimney since it was a 3 story house. Too much trouble I guess but getting on the roof by the chimney was very easy. He had a chimney fire violent enough that it blew the brick chimney wall out through the plaster wall on the 2nd floor.
In a SHTF scenario you will be the only chimney sweep while burning a lot of whatever wood you can easily get. Keep a chimney brush if you have a chimney. Those chemicals help reduce creosote buildup but not that much and a slow all night fire will build creosote rapidly.
In a SHTF scenario you will be the only chimney sweep while burning a lot of whatever wood you can easily get. Keep a chimney brush if you have a chimney. Those chemicals help reduce creosote buildup but not that much and a slow all night fire will build creosote rapidly.