Roof cleaning. Kescor understands TPO roofs (Thermoplastic polyolefin). These single-ply roofing membranes are extremely popular with restaurants but must be cared for in a very specific way. Grease is acidic and will violate your roofing warranty, so you must do everything possible to keep liquid grease from getting into your exhaust fan in the first place. Liquid grease is a result of slow airspeed. Slow airspeed is directly attributable to grease clogged hood filters. Let Kescor keep your kitchen breathing and your airspeed moving as it was designed. We can keep your TPO clean and under warranty.