Here’s how to remove set-in stains:

Sponge the stain with hydrogen peroxide.
Rub bar soap into the stain and scrub by hand in cold water.
Apply laundry pre-treater or rub in liquid laundry detergent, and wash the remaining stain in warm water with a fabric-safe bleach until the stain is gone.
Avoid putting it in the dryer afterward though!

Fact

A light-year is the distance covered by light in a single year.

Light moves at the velocity of about 186,411 miles (300,000 km) a second.

So one light-year equates to roughly 5,903,026,326,255 miles!