I've used it on old garage windows with caked edges, I've cleaned the edges thoroughly with a razor blade and cleaned the windows well, using lots of soapy water on both surfaces and using a floor mop and mine was smooth and clean. In my case it was better to cut the film to the exact size minus a tiny bit because the first piece I made, cutting the edge with a razor blade, resulted in dirt penetrating under the film to the edge . So I don't recommend the "cut an inch more than you cut" part of the instruction.
Coavas Blackout Window Film No Glue 100% Light Blocking For Day Sleep, Privacy Static Cling For Home Security And Aquarium, Frosted Black 35.6 X 118 Inches
41 Review
Enhance Your Privacy And Comfort With Our Window Film β Stained Glass Door Film, Anti-UV & Heat Control, Perfect For Office And Home
43 Review
3D Decorative Non-Adhesive Removable Window Film Privacy Sticker Vinyl Cling For Living Room Kitchen Office - 17.7 X 78.7 Inches
43 Review
MIUCO White Sheer Embroidery Trellis Design Grommet Curtains 95" Long For French Doors - 2 Panels (2 X 37" Wide)
41 Review
White Metal Wedding Arch With Climbing Plants Decoration, Perfect For Garden Bridal Parties - Adorox 7.5Ft Arbor Set
45 Review
Black Rose Garden Arch By Gardman R350 - 75 Inches Tall, 39 Inches Wide And 19 Inches Deep
41 Review
Pink Artificial Fake Wisteria Vine Rattan Hanging Garland Silk Flowers String Home Party Wedding Decor 43.2 Feet (12 Pack)
41 Review
Artificial Hanging Vines, 12 Pack 84 Feet Fake Green Leaf Garlands Home Office Garden Outdoor Wall Greenery Cover Jungle Party Decoration
37 Review