Quoted from ForceFlow:What glass cleaner do you use on playfield glass and the front of backglasses that won't leave streaks, residue, etc?
I use this.
Happ Industrial Strength Arcade Pinball Glass Cleaner 19 oz. https://www.amazon.com/dp/B00L5RN32O/ref=cm_sw_r_cp_tai_JxYXCbPPWHDXN
A little goes a long ways. And micro fiber towels.