The answer would be Paper. Once, paper if soiled or contaminated with food, oils etc. it cannot be recycled as the contaminants cause problems in the recycling process.
Why can't paper be recycled?
When paper is soiled with food or other contaminants, it causes problems in the paper making process. In addition, many paper products have a thin petroleum plastic lining to give strength to the product and prevent leaking. This petroleum plastic lining is consider a contaminant in the composting process so they cannot be composted. In paper making factories, paper is mixed with large amount of water in a churner. Since, oils and food contaminants are insoluble in water, it mixes with paper fibers and eventually a new paper with oil splotches is produced.
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