Hello nairalanders, a friend of mine told me to purchase a chemical call Tona/Thona ( don't know the correct spelling) according to him, he described it as a black liquid substance that is as black as charcoal in colour that is used in washing stained container or so.
please does abyone really knows what am talking about and how i can get it?
I've gone to people selling building materials to ask of it and they told me they don't know what am talking about, maybe because the pronunciation is wrong because my friend told me i should ask of it from people that are selling building materials.