Contact Hollinger Corp. in Arlington, VA for a catalogue - they carry acid-
free "hollinger boxes" and acid-free tissue paper for collections storage.
Plastic is not the way to go as you want them to 'breathe' where plastic
storage boxes which do not ventilate can hasten decay plus the plastics are
off-gassing potentially damaging chemicals.  Common cardboard boxes and paper
are highly acidic and will damage organic materials (such as wood, textiles,
etc) over a short period of time.

Bisque doll should be stored face down due to plaster mounting supporting
glass eyes - this weakens over time and can cause the eyes to fall back in the
head breaking eyes and/or cracking the bisque.  Most curators store all dolls
face down for this reason.  Clothing, textiles, etc. should be interleaved
with acid free tissue.  Prior to repacking the dolls use a low suction vacuum
with a piece of fiberglass mesh (tape edges to prevent damaging artifacts) to
remove any dust, possible insect eggs, debris, etc.  Dust and dirt has a way
of damaging textiles over time hastening decay.

For cleaning - least done the better- because condition is all important for
both historical and collective 'value'.  Twin Pines of Maine produces a series
of products which are suitable for cleaning plastics and bisque.

Good luck with your project.

David Voelkel
Curator
James Monroe Museum