Efflorescence & Rust Remover Removes efflorescence salts, rust and hard water deposits from horizontal and vertical concrete, pavers, brick, masonry and stucco surfaces. Features & benefits include: Use to remove efflorescence, rust and other stains from surfaces. Ideal for use on concrete or paver patios and walkways, and masonry or stucco walls. Renews concrete, masonry and paver surfaces. No scrubbing required.