Why not sanitize the hoses at the same time?
I connect all of my water hoses together then flush them with fresh water.
Then I disconnect from the hose bib and drain the hose onto the ground, not into the tank.
Then I put one end into the tank filler tube, then pour in the appropriate quantity of bleach into the hose just before connecting it to the hose bib. Full strength bleach goes through the hose as it goes toward the tank.
I've been doing it this way for 20+years.
2014 Silverado 1500 5.3L maximum trailering package (yes, I'm towing the 34')