I have a pair of pants which I've noticed have a stain somewhere. What I'm seeing is a small ellipse-shaped stain on one of the 'legs' - a darker color than the fabric's original color. The thing it, I haven't worn them for a while and for the life of me I can't remember how they got this stain and what from. The pants have recently been dry-cleaned.
How would I go about "diagnosing" which stain this is for the purposes of removing it - so as not to set it in stronger or harm the fabric trying to remove it?
Note: The stain doesn't have any thickness or different feel to it - other than the color it feels the same as the surrounding material.