Dye laminate which lost its color because of detergent
most of the blue dyes in toilet cleaners are copper sulphate pentahydrate.  flushing the stain with dilute muriatic acid should re-dissolve it.  be gentle, wear gloves and a respirator, and keep the area small.  flush with water and baking soda immediately after you notice the stain is gone to stop the reaction from progressing too far.  seal afterwards with wax, acrylic, urethane, etc.