This two-stage method can help stretch the useful life of cleaning solutions. You can also put filters and screens on solvent sinks and water-based cleaner sinks to remove solids from the solution. Keep the wastes separated. Spent solvents should always be collected and stored in separate containers. Mixing them with other wastes such as oil, water, or antifreeze, can limit their potential for reuse and recycling which can cost you more money.
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