Tough job, you could have used disinfectant as soon as it spill.
My friend had the same problem but it remained, and is fading slowly.
Seaman stains
Depending on the type of mattress pad you use, they can be hypoallergenic, avoid stains on the mattress, or simply for comfort.
it is coffee
baking soda
The best way to remove semen stains from a mattress is to sponge the mattress with cool water and a detergent solution. Next, rinse the area and blot dry with paper towels. Leave the mattress to dry naturally. If a powdery residue remains, use a soft brush to remove it.
Stains.
Shout removes stains from jam, grass stains, coffee stains, ink stains, blood stains, motor oil stains, etc.
this is very hard to remove, you can try a solution of vinegar and water, but in the long run, throw the mattress out.
hot water and soap
No it is probably urine, white is semen. However, dried semen may be off-white.
your momyour mom coffee
Brush your tongue