when cleaning glass, specifically the inside of the windshield i notice this greasy film that i cant seem to efficiently remove, typically i use invisible glass and two towels which in most cases works for everything except in this spot, i can get it clean it just takes FOREVER! theres gotta be a better way what do you guys suggest? ive thought about using an ammonia glass cleaner only for this spot and only if it doesnt have a tinted visor strip but figure ill come pick your brains before i go there! thanks in advance!