delete plugin remnants

Hi,
I want to get rid of some remnants of plugins that I do no have on my home machine.
It is geometry as well as modifiers. I kill the geometry with this:

(
	for o in objects where classof o == Missing_Helper do delete o
)

I do so because I cannot select those objects by hand (they dont show up in the scene list). Same thing with the modifiers, I dont know on which objects they are and I dont want to search on like 500 objects in the scene. So I would like to find them the same way as above, like:

(
	for o in objects do
        (
            for m in o.modifiers where classof m == "I_HAVE_NO_IDEA" do
              deleteModifier o m
         )
)

So I dont know what class to search for. Any ideas or suggestions?
Cheers