#to clog

• To foul — To become covered or to cover with a thin or thick layer of residues, carbon deposits, soot, grease, or impurities resulting from thermal or chemical processes; to clog or block due to parasitic deposits. This mechanical phenomenon affects the normal operation of spark plugs, filters, injectors, or other metal parts exposed to incomplete combustion or contaminated fluids.
• To plug — The act of completely covering an opening, a pit, a channel, or a container with a stopper, a lid, soil, or another suitable material to block the passage of fluid, air, or light. Used reflexively, it refers to the clogging or self-obstruction of a pipe, duct, or anatomical pathway (such as a blood vessel or gland) due to the accumulation of debris, sediment, or organic secretions.