without reading those, i used mineral spirits in mine about 15 years ago. it messed up the internal parts in the pump motor with a quickness. i just used paint brushes with it since then. BTW, i had my bare hands without gloves submerged in the solution for all afternoon one day washing some bike parts, and felt real ill after a while. general sick cranky feeling and bad headache. it was the mineral spirits absorbed through my skin on my hands. i never used that washer without gloves since then.