Originally Posted by
Gtrubicon
I have been a licensed tile contractor for more than 20 years, I have several mixers of different types. the way we clean our mortar mixers is to put a 5 gallon bucket of clean 3/4 gravel, crushed not round river rock, a gallon of muriatic acid and 5 gallons of water and fire up the mixer, the acid dissolves the cement. When done spray the mixer with water to neutralize the acid. We use a cheap air hammer to break up the big build up prior, don’t beat the outside of the drum with a hammer, it will dimple the drum, it gives the cement a great place to bond to, makes your next clean out more difficult.