1 year: lint
5 years: string
10 years: water
15 years: dirt
20 years: leaves
25 years: oil
30 years: hay
35 years: Styrofoam
40 years: cardboard
45 years: glue
50 years: rubber
55 years: fiberglass
60 years: linoleum
65 years: plastic
70 years: cement
75 years: rope