In case you don't want to read this whole long post, the short answer is no, quilter's temporary basting spray does not wash out. It will eventually stop being sticky, but I don't think it actually goes away when washed (at least the two brands I tried didn't wash out when washed in cold water).…
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505 Adhesive Spray – Quality Sewing & Vacuum
Repositionable: The basting spray can be repositioned multiple times without losing its effectiveness. Acid Free: The spray is free of harsh acids
Odif Basting Spray, 6.22 oz, Clear (Тwo Рack)
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Odif 505 Temporary Basting Adhesive Spray for Fabric 14.7 oz
Odif's 505 Spray 6.22 Oz (3-Pack) - Temporary Basting Adhesive for
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