Hello Sunl adn welcome
The cause of blockage of catheter is most probably a Urinary track infection. You cannot do much at home to remove this but by flushing
the catheter with normal saline every hrly will help you. Also change the catheter after every 4-5 days. Also give plenty of fluid to flush the urinary pathway but keep a record on total intake and output of fluid.
In my opinion you must consult your doctor and give him a proper antibiotic to overcome from the infection. Hope this will help you.