Heard about using sonic pulses to scare off root parasites. Sounds like sci-fi but apparently works on some vineyards.

Heard old carpenters used water levels for tricky spots, makes sense.

Tried making a clay mask once myself. It dried so hard I couldn't smile for an hour. Your story made me laugh because I know that panic feeling. I had to use olive oil to get it off, and my skin was red for days. Now I stick to store-bought stuff to avoid embarrassing myself again. Glad you turned her disaster into a win for your salon.