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Yes, you can screw directly into stucco. Only do so if the item you are installing is a permanent fixture. Drill a pilot hole into the stucco using a masonry or concrete bit, then drive in the screw with a power drill or screwdriver.

The best adhesive that works on stucco is usually a product specified for use on stucco or concrete surfaces. The adhesive will need to be strong to grip the stucco, but should also wipe away clean when used in a temporary application. You can also consider using super glue or hot glue on stucco.

It’s not advisable to use CLR on stucco. CLR is a powerful acidic cleaner designed for removing tough mineral stains. Stucco is a porous material commonly made of cement, lime, and sand. The acidic nature of CLR can potentially damage or etch the stucco surface, leading to discoloration or deterioration. 

It is best to use cleaning solutions specifically formulated for stucco or mild household cleaners mixed with water to clean stucco siding. Always test any cleaning product in a small, inconspicuous area before applying it to the entire stucco surface.

Masonry screws are the best option to be used on stucco. They’re thicker and made to penetrate harder surfaces like concrete and cinder blocks. Fluted masonry screws work the best because they create a stronger grasp thanks to the lines on their shafts. If you’re working on exterior stucco, use galvanized screws to prevent corrosion.