(Instruction video below text)
The 'Clean It' solution is designed to remove undesired stains and remnants from the liquid brushes used in steps 1 and 3, which could potentially cause hardening.
To utilize it effectively, substitute the brushes from the corresponding liquid with the 'Clean It' brush. Let the brush steep for a minimum of 2 hours, though letting it soak overnight is recommended.
Once the soaking period is over, simply return the brush to its original bottle.For instance, if you start the process with Bottle 1, let them sit for 2 hours and then exchange the brushes back, then follow the same procedure with the next bottle.
Watch the video below on how to do it: