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[[Ultrasonic]] cleaning is currently being investigated as a possible alternative to conventional [[dry cleaning]].
Ultrasonic waves pass through a solution of water and soaps, and the
molecules (should this say "particles "?) of soil, being more dense than the fiber, separate from the fabric.
Results have been encouraging enough that it is being developed further, but the effect on fabrics is not completely clear yet. <ref>[http://www.epa.gov/dfe/pubs/garment/tech_rep/clothes.pdf Training Curriculum for Alternative Clothes Cleaning], the Massachusetts Toxics Use Reduction Institute, University of Massachusetts. See also the answer and links at [http://answers.yahoo.com/question/index;_ylt=Ajs8T71dR8bHe0QhrfzEV0IjzKIX;_ylv=3?qid=20060930200640AAPL9A5 Yahoo Answers].</ref>
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