You can take it apart, Wash the backing to remove the spray. I would purchase a new batting. As for the top I would lay it flat seams up and mist it with water, this may take a few times . Test this in a smaller area to see if its working. It is likely that it will require re- pressing before you send it. Not sure if this will be the "cure" and may be more trouble than you want.
I am not sure about basting the whole thing , but if you are wanting a crinkled look eventually, the batting is going to go through the shrinking prior to quilting.