Percolator not getting cleaned

Hi, I am trying over a day to get my bong clean, and have tried almost all the things online. Vinegar, baking soda, rock salt, bong cleaners, shaking the bong, keeping it overnight etc etc. Most of it got cleaned, but the capillaries and the bulb inside the percolator doesn't seem to. I have shaken it vigorously with the bong cleaner, but it doesn't seem to work too much.

Please suggest some proven methods that will fix this somehow, or some proportion or amount of cleaning fluid to put etc.

(Yes, I know I should have cleaned it sooner and more frequently, but alas I cannot now)