Around 1998 I soaked 8 used 1994 Magnum 5.9V8 used pistons in various chemicals in Folgers Coffee metal cans and the Liqui Moly “Ventril Sauber” from BMW dealerships ( means valve cleaner in German) did best,
better than Chevron Techron, Seafoam, ATF+2, Mobil One 10W-30, acetone

Last edited by 360view; 03/06/20 10:17 AM.