How long does weed stay on your fingers? And also if you touch something does that thing get full of weed or whatever?

I let my friend borrow my book last year around jan. Got it back in june and i remembered he smoked... Now yes of course its been a while since i got it back, but i was just curious if all that stuff stayed on the book or if its gone by now or if i should have cleaned it or what? Lol
Thank you!
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