Mix equal parts baking soda water and salt for highly soiled areas.
Best solution to clean concrete mixer.
You should now have a clean cement mixer ready for work again.
Despite the antiquity of this method it is not too useful for concrete mixers.
Pour some water in the drum along with some old bricks or rubble and leave turning for about 30 minutes.
Try putting broken up bricks in there with acid mortar cleaner and water and turn it on let it spin.
When mixed with normal household vinegar and baking soda in a bucket with hot water you get an effective grease cutter and cleaning product.
Could give this a try.
Put on protective gloves and a breathing mask then apply the solution according to.
Hydrogen peroxide or ammonia also work well too.
You can tilt the drum a little so that the rubble scrapes the upper edges of the drum.
Semi dirty outdoor concrete cleaner bleach water 1 8 cup dishwashing detergent.
Your supplies are likely to be a bucket scrub brush and detergent.
Empty the drum of rubble and water.
Clean baking soda residue by spritzing it.
Apply a diluted hydrochloric acid solution to the inside of the drum if the cement still refuses to break free.
Borax or laundry detergent are the first ingredient in your homemade concrete cleaner.
These products are good for removing basic dirt and some stains.
Often the sharp edges of the spade damage the inner surface of the drum which further adversely affects the cement solution.
Leave it 10 minutes or so maybe give it a few hits on the barrel as it spins.
For a gentle cleaning solution add one half cup of baking soda to 1 gallon of water.
Answered 3rd may 2017.