Is Persil ProClean effective on old stains?

Persil ProClean is a first-responder, not a cold-case detective. It handles fresh stains spilled an hour ago, but for stains from three days ago, you’ll need an oxygen bleach pre-soak and a dedicated spot remover first. The product works best within a few hours of the spill — after that, the stain has set its roots and Persil alone won’t pull them out.