It's best to clean the fouled plug. Of course, the problem
is NOT with the mag.



Does that mean that you would shut your airplane down in the run up
area, get out, open the cowling (top and bottom), get out your tool box,
pull the spark plug and clean it on the spot right there? That might
look a little odd, especially at a busy airport. Perhaps I am not
understanding you correctly.

-Sami