Homebrew PCBs

Hi all,
 
I use prozone plus in my ultrasonic cleaner to clean my PCB�s after
soldering.
This liquid is manufactured by Myulticore and is very expensive (about 50 US
/ L)
I need 3 L to fill my ultrasonic, so I need about 150 USD.
 
Anyone knows the composition of this product or any other cheaper
alternatives?
 
TIA
 
Joaquim
 
 
PS: With ultrasonic and Prozone the cleaning is perfect !

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