How do I remove flux after soldering the PCB board?

It is essential to remove flux residues after soldering. Flux residue can be cleaned with an isopropyl alcohol (IPA) solution.

How to clean the PCB assembled boards after soldering?

soldering tagged pages

Cleaning Up Your PCB (with Pictures) - Instructables

Ultimate Guide to Cleaning Electronics

Cleanliness Requirements for Assembled PCBs

Is there any machine to remove the solder on the PCB board? - Quora

How to clean flux residues? - EC-RAT

Mechanic Lead-free Soldering Flux Clean Liquid ,Phone PCB Board Repair Degreasing Oil Cleaning Agent Soldering

That shiny brown stuff is flux right? Is that bad? Should I remove it? : r/AskElectronics

Clean PCB and PCB Assembly Guide - Vinatronic inc.