Are you looking for ways to reuse them?
Thanks Holly but trying to clean it of stains.
If you are trying to repurpose it....here is a project:
A bleach and water mix is usually sufficient to clean plastic cutting boards. Start with a 10 parts water to 1 part bleach. Either submerge the board, or wipe the surface with a very saturated rag. Let set 30 minutes, then scrub and wash well. Let it air dry.
You can also put them in the dishwasher