What is the best way to clean the transfer roller

dont clean, unless glued up, but they dont like it, can spot remove stuff with metho, but they last about 60000 pages cause little problems unless torn, Some models just unclick by buttons either side near hinge others are fixed and normally thrown if damaged or charged heaps.... Most faults are alignment issue, faulty remanufacture cartridges or damaged fuser (hot bit) roller causing creasing..

if really required than can try blower for cleaning the transfer roller
generally its not recommended to touch the roller as Minor oil or dust can cause print quality issue