I bought these in January.  First time I cleaned them... the blue came off.  After the 1st one I cleaned the rest with water only.  Color still came off.  They are not very blue to start with when they are turned on they are almost clear.  Now that blue has mostly washed off they are almost clear.  They are in the kitchen so they need to be cleaned more often.  Disappointed that blue is so light and washed off.