Maybe redo the roof with clear plastic of the 3 mil variety? Might find some salvo at a home improvement type place... they tend to cover sand and bagged varieties of products with it, and you can "weld" it with a heat gun.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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