In alt.home.repair, on Sat, 22 Jun 2019 14:14:03 GMT, Howtodo
m wrote:

Will a 1:8 dilution of muriatic avid harm my asphalt roof? I plan to attempt
to remove some tar from the brick on house that is above my back porch roof

Muriatic acid won't work afaik, but if it had worked, you should put a
drop cloth down, a thick absorbent one, or one impervious to whatever
solvent you're using, or more than one layer. One folded over, several
layers which you can move to the side as you start cleaning to the side.