Seeking Cleaning Advice

you can try an enzyme. Is it one color or multiple? You can soak in a solution that may help, but it will brighten and pull the color. Here is a link to the enzyme that you can just try first in a regular load of laundry. If it doesn't work you can try the soak.
http://healinghappens.myshaklee.com/us/en/products.php?sk...

2 tablespoons of the enzyme and 2 of this laundry product:
http://healinghappens.myshaklee.com/us/en/products.php?sk...

try using pet products from a pet store.

Or, Clorox for colors.

kids n pets...soak it in it & then wipe it & let it dry. If you can drag your matteress out into the sun, it is the best! let the sun bleach it out. you can also make a paste of baking soda & water & apply it, let it dry & then vacuum off. good luck I've done all of the above, but I like the sun the best.

Soak in oxi -clean and if you have dreft detergent for babies, use that when you wash it (it has an enzyme in it to remove pee and poo).