Anyone can suggest me to automate the removal of SPS web.config
entries of which we have added?
For webpart assembly automatically removes.
Now I have some left information in web.config. those are:

Using XML streamreader is danger! as if somebody changes the entries
by giving space, etc the entries will not delete.

I thought to add the <!--Comment--><!--EndComment--> for my entries in
web.config. so that I can read this through xml and make all between
entries empty and rewrite web.config.

Can anybody give some good link to do this work? I have no idea how
web.config and xml file load etc.