Homebrew PCBs

Hi, all
 
What is the best way to clean a PCB (remove solder flux) ?
 
I heard of 2 methods:
 
1-isopropyl alcohol bath with a temp. of 40 degrees Celsius.
 
2-Ultrasonic tank with appropriate cleaning product.
 
I had found some cheap ultrasonic tanks on ebay. Do I need to buy one or is
the first method good enough?
 
Thanks in advance
 
Joaquim
 
 
 
 
 
 


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