A portable and modular cooking oil cleaning system includes a wheeled carriage module, a filtering module rested on the wheeled carriage module, and a pump module removably coupled to the wheeled carriage module. The pump module includes a cooking oil return outlet coupled in fluid communication to a cleaned cooking oil inlet configured to be removably coupled in fluid communication to the cleaned cooking oil outlet of the filtering module so as to form a cooking oil flow pathway through the filtering and pump modules from the filtering module to the cooking oil return outlet of the pump module, and a pump. The pump generates a flow of used cooking oil through the cooking oil flow pathway, and the filter system of the cooking oil filtering module entraps contaminants from the flow of used cooking oil in the cooking oil flow pathway through the cooking oil filtering module.