The best method to clean the glass on your Integrity window is to first soak the glass surface with clean water to loosen dirt or debris . Use an approved cleaning solution found at www . marvin .com/cleaning and apply a with non-abrasive applicator .Click to see full answer. Beside this, are Marvin Integrity windows good? Marvin Integrity Windows One has a wood interior and fiberglass exterior. The other is fiberglass on both the interior and exterior. This is a decent window but I do NOT recommend it. The main reason this window is not recommended is because of the window casing.Also Know, how do you paint Marvin Windows? Paint with sash or panels open (or removed) and do not close until thoroughly dry. Apply one coat of primer and two coats of top quality paint according to the paint manufacturer’s instructions. DO NOT APPLY PAINT TO THE MARVIN FACTORY PREFINISH WITHOUT FIRST CONTACTING YOUR MARVIN DEALER FOR PROPER INSTRUCTIONS. Accordingly, can Marvin Integrity windows be painted? Do not apply paint to the Integrity factory pre-finish without first contacting your Integrity dealer for proper instructions . When painting Wood-Ultrex series interiors, use only a high quality oil base or latex paint . To provide a good adhesion of paint, a compatible prime coat should be applied .How do you clean the inside of a double hung window? How to Clean Double-Hung Windows Remove the screens from the windows. Unlock and raise the lower sash 2 to 3 inches. Take a moment to vacuum or clean out the bottom sill of the window. Grip the tilt-latches/sash releases and slide them inward while pulling toward you. Tilt the lower window so that it rests on the lower sash.