Phosphoric acid
Cillit Bang Grime and Lime Spray (known in some countries as "Easy off Bang/Bam Power Grime and Lime Cleaner Trigger") product contains two acids: sulfamic acid and phosphoric acid. Phosphoric acid (also known as orthophosphoric acid or phosphoric (V) acid) is a weak mineral acid with the chemical formula 34 and applied to rusted iron or steel tools or surfaces to convert iron (III) oxide (rust) to a water-soluble phosphate compound.