Samsung Blu-ray Player Safety Precautions page 22

Storing/Cleaning Disc
This part of the manual is to prevent damages or data loss.
Read carefully and use the device properly.
Do not touch the surface of the disc.
Place your fingers on the edge of the disc to hold.
Clean the disc lightly with soft cotton cloth, starting from the center and move to
the edge of the disc.
Use only disc cleaning liquids. Do not use benzene, paint thinner, or any other solvents.
If the disc surface becomes dirty with fingerprints, foreign substances or dust, the disc may not
function properly.