sometimes it need , fist coloared more with weight map,, to delete the weight ,,
1 more coloerd with holding “ctrl” key ,(soft coloer ,,I think)
the area where you want to delete,
2 then use “alt” key holding , use brush tools then delete the area.
or I sometimes
1 select the poligons , (need change tools to poligon group editor first,,) by rasso or drug mode.
then return to weight map tool.
right click on the 3d window, then ” fill the selected faces” by “weight 0 %”
after that,, delete the coloerd area (around border may still keep some weight)
by “ctrl” and ” alt” to adjust.
if you need check,,right click ,3d view, then change weight display mode,, “weight veritces”
it tell you where you remain the weight more clear. I often coler weight ,, another area ^^;
