QA: Petua (1)

Now, lets start a new section called "Petua". I have one issue here. Most of my working shirts (white and blue -> yeap, I only wear white, blue or mixture of these two colours shirts to work, no other colour) that I left for some time in the closet turn 'yellowish' on the collar. It seems that I could not get rid of it. It looks quite obvious whenever I wear them.

Does anyone of you know how to get rid of this 'yellowish' stain? Appreciate assistance.... :-))

~ M T @ Q 4 t 4 r
~~ Sadd, D0ha

~ To Travel Is To Discover Oneself ~