May I suggest using a very viscous solution of Murphy’s Oil Soap and soak those “ruined brushes.” I’ve been able to rescue some very stiff brushes. I have UHU in the purple and it works beautifully every time. Enjoyed watching this piece come together.
I loved watching this video! In the end you mention a followup video with the final work on the collage. I can't seem to find it. Can you help? I'd love to see the end result