The answer to 'why is my vacuum buildup' is that a clogged or dirty vacuum cleaner can cause a buildup of dirt, debris, and hair in the vacuum's hose, filters, and interior. This can lead to reduced suction power, poor cleaning performance, and even damage to the vacuum's motor.
Common causes of vacuum buildup include not regularly cleaning or replacing the filters, using the vacuum on carpets with a lot of pet hair or fine dust, or not properly maintaining the hose and attachments. Symptoms of vacuum buildup include reduced suction, the vacuum working harder, and visible dirt or debris in the canister or hose.