Take two tea bags, put in a cup, just about cover them with boiling water, leave it to cool, then put the liquid on the white marks on the laminate flooring. Just rub in gently with your fingers, leave for about half an hour, then remove some of the liquid with a tissue to check the result. The liquid (tea, which has tannin in - the colour agent) will have started to dry out. If the white mark is still evident leave for another 15 mins, then just wipe the area clean with a soft damp cloth. This worked for my laminate floor and it is now fully restored.
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Has anyone ever had trouble with milky white spots on laminate flooring? I have these all over my laminate flooring for no rhyme or reason.