I have a linoleum floor that is 10 years old, and....?

...in one place in my utility room there is a 5-6 foot area that appears yellowish in color. I've washed and scrubbed it with all kinds of cleaners - even those designed by Armstrong - the manufacturer of my flooring. Nothing gets rid of the stain. I wonder if somehow the glue or adhesive used to put the floor down is leaking through and causing the stain. Any advise would be appreciated! Thanks.