How to get water stains off wood<br>Put mineral oil on a soft rag and rub it into the stain. Let it sit overnight and repeat if the stain seems to have diminished. Rub the stain with mineral spirits on a soft cloth if the mineral oil doesn't work.
Mineral oil prevents stains.
It doesn't state that mineral oil can be used as a prevention method, only that it can be used to treat stains.
( z1 prevent :ARG0 ( z2 oil :mod ( z3 mineral ) ) :ARG1 ( z4 stain ) )