Have a clp300 sticky keys - Yamaha Music

Not sure what you mean by sticky... If sticky to the touch, clean them carefully with a soft cloth wetted with Windex and then dry with dry cloth.

If the keys stick down, check if there is clearance from the board in front of them. If they are dragging here, you may need to have the keyboard adjusted to have adequate cleance. This is not an uncommon problem that can happen due to warping or humidity and temperature changes.

Drag a business card between the front of the keys and the front rail to check for clearance.