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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.

You can use small bits that are up to 3/8 inch in diameter, or larger bits that are 1/2 inch or more in diameter. Make sure the bits you use are coated with carbide or diamond; this information is usually visible on the package. You can also use hole saw bits to drill into stucco.

The decision to repair or replace stucco depends on the extent of the damage. For minor issues like small cracks, holes, dirt, stains, or discoloration, a repair is typically sufficient and more cost-effective. These issues can often be resolved with a simple repair, a deep clean, and possibly a new coat of paint. However, for more significant problems such as large cracks, peeling, mold, algae, or structural water damage, a replacement might be necessary. In these cases, it is best to call a professional stucco contractor for an inspection. An expert can assess the severity of the damage, determine if there are deeper issues, and advise whether a repair is adequate or if replacing a section or an entire wall is the more cost-effective, long-term solution.

A standard drill will work just fine if you’re drilling small holes, and only a few of them. But anything with a diameter larger than 3/8 inch is best done with a hammer drill, since it is stronger, faster, and also makes your drill bits last longer. While you don’t absolutely need a hammer drill for stucco, it is a worthy investment if you think you might drill more holes down the road.