A: 

Same problem here but using Maven

A: 

Have you tried NetBeans 6.9? I only ask because my jaxws-build.xml looks different to yours (all auto-NetBeans-generated).

<wsimport 
    sourcedestdir="${build.generated.dir}/jax-wsCache/ListProductsService" 
    destdir="${build.generated.dir}/jax-wsCache/ListProductsService"
    wsdl="${wsdl-ListProductsService}"
    catalog="catalog.xml"
    extension="true"
    verbose="true" 
    wsdlLocation="file:/C:/NetBeansProjects/wsclient/ListProductsService.wsdl" 
    xendorsed="true">
    <depends file="${wsdl-ListProductsService}"/>
    <produces dir="${build.generated.dir}/jax-wsCache/ListProductsService"/>
</wsimport>

The above wsclient project is able to be cleaned and built without the web service reference being online.

Catchwa
These are legacy projects which were made before I showed up, with I think NetBeans 6.7 or earlier. I've noticed that some of the projects actually have their depends/produces elements set up OK, while others don't, so it seems there should be some way to make 'em work. The annoying thing is that regenerating the `jaxws-build.xml` doesn't help, regardless of NB version. Oh well, we're migrating to Maven soon, anyway, and hopefully we'll have more luck than @user369572 did...
gustafc