Which of the following is a tool used to clean forms?

A stiff-bristle broom is an effective tool for cleaning forms, especially in concrete work. Its design allows for the easy removal of debris, dust, and any residual concrete that may adhere to the surfaces of the forms after pouring. Using a broom helps ensure that the forms remain in good condition for reuse, as it can prevent the buildup of material that might affect the quality of future pours.

In contrast, while a concrete trowel is essential for finishing concrete surfaces, it is not suited for cleaning forms. A high-pressure washer, although it can remove stubborn residue, may not be necessary or practical for cleaning forms and can potentially damage them if not used carefully. A concrete mixer is intended for mixing concrete and is not relevant to the cleaning of forms.