This will look like Domex.
Its cleaning performance will be either Equal  to Domex or any premium quality toilet bowl cleaner.
The concentration of the acid you use is very important. This will affect Consistency. So, you should first try one or two small batches to get the right Consistency .
You can add perfume to this.
 
List of raw materials used in this formula:
 
Hydrochloric Acid
Citric Acid
Polyvinyl Alcohol
Acid Green (color solution)
Cocoamidopropyl Betaine (C A P B)
Perfume
Alphox-200
Butylated Hydroxy Toluene (BHT)
Propylene Glycol
Cetrimonium Chloride
HRP Acid Thickener