Spray onto desired surface and leave for a while, then wipe off. When using on heavy grease, can leave the cleaner longer time before wipe off. Repeat or use a scouring pad for better performance. When using on exhaust hood, spray directly onto the fan and leave for a while, then turn on the exhaust hood. Dissolved grease will drop off. When using on metal, ceramic, glass and wooden surfaces, spray on the wipe and clean the surface. Perform trial for other surface like paint, and always rinse completely after use.