The Winbot X can be used on most windows. However, please use discretion on older or extremely thin windows. If the window is already cracked, do not attach the Winbot to it.
All Winbots will have trouble on convex, concave or curved windows. The Winbot relies on suction to remain attached to a window - these windows will allow air to escape, causing the Winbot to drop.
The Winbot can clean a glass table top, or other horizontal windows - but you will notice it will clean in a more random pattern.
Lastly, please do not use the Winbot upside down - as in, do not let it clean the underside of a skylight. However, it can clean slight inclined or declined windows - but please monitor its use closely.