Here's a link to Retro Clean:
http://www.retroclean.com .
Regarding storage, the safest is probably to place it on a large guest bed and cover with a sheet. This keeps it stored flat without stress on the thread, and the sheet protects it from dust and light.
You definitely want to protect the fabric from light at much as possible because light fades fabric. Direct sunlight is the worst, but indirect sunlight and even incandescent and flourescent light are also bad.
If you want to hang the quilt on a wall, it would need to be thoroughly thread-basted to a cloth backing fabric.
Actually, before you do anything with it, you might want to call around to museums to see if you can locate a textile conservator in the area. That person would be able to give you the best advice on cleaning and storage.