Reverse bleeding brakes

[ZombiePotatoSalad]

I'm trying to reverse bleed my brakes. I took them all apart and cleaned all the gunk out. I have a syringe and a tube. However, the brake fluid doesn't seem to want to go back in through the banjo bolt.

[fastbysuzuki]

However, the brake fluid doesn't seem to want to go back in through the banjo bolt.

By banjo bolt you mean bleed nipple?
normal practice would be fill the syringe and pipe connect to bleed nipple open nipple force the fluid vai the syringe shut nipple whistle sill applying pressure refill syringe and repeat.
if the fluid will not go through the nipple then there must be a blockage somewhere this could be in the master cylinder if the hole is blocked there.
Have you stripped the master cylinder? Is it assembled correctly.

[Grimly]

The small hole on the bleed nipple is commonly blocked by crud, not only the bigger hole down it, but the small hole to the side at the bottom.

[ZombiePotatoSalad]

I've taken everything apart and blew brake cleaner through everything. The hole in the center of the bleed nipple is clear enough to put the straw into. I think I may have found a solution.