I love my spray bottle of sanitizer.
I use Star-San as my sanitizer. I never really appreciated the utility of the spray bottle until my brewing frequency picked up. I took an old house cleaner spray bottle that we were throwing out. Rinsed it several times with hot water. Soaked and rinsed it with PBW. Now when ever I make a larger batch of sanitizer in a brew session I refill the spray bottle.
I use the spray bottle for things like the outside of an airlock. I spray down the top of a fermentor before I open it. I spray my kettle lid before I put it on after chilling to protect the beer before I transfer. The spray bottle works great at spritzing some foil that I put on top if my starter flasks. I spray the start flask before I take off the foil, and before I pour stuff out of the flask.
Having a spray bottle of sanitizer handy makes beer chores between brew session easier.
I highly recommend getting one in your brew house. I even use it as my deodorant now in the morning.