I need help fixing this painting.please help.....

Question

so ok i got this 47 year old jesus pic andd i looked on line how to clean it i thought it was a oil painting and it wasentt it said to use a lil bit of waterrr thee only reason i wanted to clean it was it was my husbands mom and she smoked alot andd all the nicotine build up after 47 year soo ye thats alot of nicotine andd it camee out good butt thee hands look really bad so can any1 help and tell me how to fix it it is a lithograph

Answer 1

47 years old should be on Antique Road Show

Answer 2

CALL A LOCAL COLLEGE THAT HAS ART STUDENTS, TALK TO ONE OF THE PROF AND SEE IF ONE OF THE STUDENTS WOULD BE INTERESTED IN HELPING FOR THE EXPERIENCE