If at all possible, _never_ remove original stenciling.  Collectors
of organettes can tell the difference.  Obviously if it is mostly gone
already you are not losing anything.  Clean it up first and see how
much stenciling is left.  Harold Draper has stencils but I do not know
what model you have so here is a link to the stencils and you will have
to pick the right one:

  http://www.organetterepair.com/store/index.html 

Good luck,
Leslie Hoffman