I use;
fabreeze and a cardboard box for cig smoke
i normally wash them one by one by hand with an extra firm toothbrushes and some dawn for dirt
sticker removal and preservation i use a clean box cutter blade and wax paper
permanent marker i use baby wipes and a dry erase marker (the color you use depends on the color of the brick for white I use blue)
discoloration I hear a hot peroxide bath works.