Q. Dear Donia,
A. Dear Wendy,
I am glad you were able to get the sampler off the backing and are working to take better care of it.
Wash the sampler in a bath in warm water with a little Woolite that is free of scents and color. Woolite is a nonionic detergent and will rinse out of the fabric more easily than regular detergent. Rinse at least twice in a lot of water. It will help with the dirt but will not help with the glue. Elmer's is not water or solvent soluble once it dries so it is there to stay. Hopefully, it is not impacting the face of the sampler.
You will want to support the sampler on a piece of nylon window screen cut larger than the piece so that you are not stressing the sampler itself when lifting it out of the water baths. It can dry on the screen on a clean cooling rack from your kitchen or a window screen taken out of the window.
Good luck, and be very gentle.