Not all spots react similarly; yellow discolorations lighten finest
https://privatebin.net/?a671a324d894190b#89oN6ecQUXDiiexd2beT1qskaVQ2exjM83iQCGW5v4XU
Not all spots respond similarly; yellow discolorations lighten best, while gray or tetracycline stains are more resistant and might require longer or expert care.