I have been using a heat gun and mini pry-bar, (screw driver) for years. The heat gun softens the bondo making it easy to remove. Then I use a wire brush by hand to get the remainder out of welds and crevices. Makes less of a mess than grinding it out with a wire brush or paint stripping wheel.

The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me