Whilst cleaning out my garage recently, I came across two large, high quality, Pelican hard cases. These are the real heavy duty ones, suitable to padlock and use for airline shipment of guns; they've been sitting, buried, untouched, in my garage for over 20 years. The cases themselves are in really nice shape, but when I opened them, the foam interiors - that spongy camera case gray foam stuff they are lined with - had deteriorated into this sticky, gooey, falling apart mess. Once I have scraped out the big pieces, does anyone know what would be a good cleaning solvent to use to clean up the sticky, messy residue?