Pleated day/night shade cleaning/reforming

The day/night shades on my rig have a sheer fabric day section and a solid paper night section. Both sections need cleaning and the paper section needs reforming to fold properly. There are a number of good tips on the web for cleaning the fabric section, including use of spray starch to reform the folds, but little specifically on the paper section.

Does anyone have any experience on cleaning the soiled paper section of these shades?

Joe