Here's how to get dried paint out of carpet with before/after shots. This paint was SIX years old at the time! Paint's not the only old stain I got out.
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How to Remove Paint from Carpet from Rachel Schultz
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Cleaning and organizing
How to remove carpet from stairs and paint them for a fantastic update.
HOME AND ORGANIZATION
You can remove dried paint from carpet with WD-40, Goo Gone, acetone nail polish remover, or paint thinner, but before you start...
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How to (try to) remove paint from carpet. Might not work, but worth trying before shopping for new carpet.