As with all carpets, prevention and vacuum regularly is the best way to keep your carpet in pristine condition.
100% Polypropylene carpets can be cleaned with all carpet cleaning methods, and can be cleaned with many cleaning chemistry including household bleach.
Do make sure you have a 100% polypropylene carpet!
You can attempt to remove a stain with a mixture of 50% bleach and 50% tap water.
Do try to avoid oily cleaning solvents as polypropylene is an oleophilic fibre attracting oily substances.