Answer
Acid brighteners fume, etch fins and corrode housings; C-Shine gives comparable foam and brightening without the hazard, so it can be used indoors.
Detailed question
Why not use an acid coil cleaner?
Products
RXSOL CHEMO PHARMA International Navi Mumbai, India
Try "boiler water treatment", "tank cleaner" or a chemical name such as "citric acid".
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Acid brighteners fume, etch fins and corrode housings; C-Shine gives comparable foam and brightening without the hazard, so it can be used indoors.
Why not use an acid coil cleaner?