Years ago, I marked my name on the back of a workman's bump
cap. To my disapointment, the ink got into the plastic, and
totally refused to completely wipe out.
Other than alcohol or gasoline, the next tries might be
mineral spirits paint thinner, or finger nail polish
remover. Please try a small bit on a cotton swab, so you
don't melt the whole plastic item by accident.
Outdoors, fresh air, not while smoking, not while using hair
dryer in bath tub, operating bulldozer with guards removed,
or cutting electrical cords with hedge trimmer. Usual safety
Christopher A. Young
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