Things You'll Need:
- Large bucket
- Hot water
- Sponge
- Safety goggles
- Latex gloves
- Potassium acetate
- Soft bristle brush
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Step 1
Determine the type of the plaster mold that you would like to clean. A mold can be made of plaster and used to cast in other materials, or a mold can be made of other materials and used to cast plaster. A mold made of plaster is likely to have a clay or dirt buildup, while a mold used for plaster casting will have a buildup of plaster residue.
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Step 2
Fill a bucket with hot water and scrub out the inside of the mold with a sponge. Ideally, you should perform this step after each casting to keep your mold working properly. This is the only step necessary to clean a mold made from plaster.
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Step 3
Mix together a solution of potassium acetate and hot water if you are cleaning a mold used to cast plaster. This type of mold will most likely be made of rubber or latex. Make sure that the solution is 10% potassium acetate to 90% water.
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Step 4
Immerse the mold in the potassium acetate solution. Let the mold sit in the solution overnight.
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Step 5
Remove the mold from the solution. Rinse the mold in clean water, clearing away the plaster buildup.
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Step 6
Run a soft bristle brush over the inside of the mold to remove any remaining plaster. Dry the mold completely.
