How to skin polish<br>Up your water intake before polishing. It's important your skin is as hydrated and healthy as possible when you go into the polishing process. To help with this, up your water intake.
Skin polishing is done with a water jet.
There is zero mention of this in the context and the water intake referred to is related to water consumption by the person wanting to do the procedure. 
( z1 polish :ARG1 ( z2 skin ) :instrument ( z3 jet :mod ( z4 water ) ) )