My store washes the outside of them when they get sticky, but you aren’t supposed to wash the inside of the pumps. They can never fully dry and the moist sugar gets gross in there lol. We just throw ours away when they don’t work properly or get old

Never clean inside and never switch between flavors. Replace when they no longer function properly.

It’s in the beverage resource manual!

no not the inside. you also don’t wanna take a pump out of like toffee nut and put it in vanilla. they stay together