Rust remover in Gel form designed for easy use in cleaning up corroded AC coils and other rust stains comes in 25 liter plastic container, the product is quite safe to use, removes rust and corrosion from all metallic surfaces, aluminum oxidation, steel rust and even brown spots on stainless steel.
The gel is thick enough to adhere to vertical surfaces, allowing the product to actually stick the a surface and work rather than run down like many rust removers that are basically water