How to remove spray paint from jeans?
To remove spray paint from clothing, a soft bristled brush, water and stain remover are needed.
1. Scrub the paint: If the paint is dry, take a soft bristled brush and scrape away as much of the paint as possible.
2. Apply water and stain remover: After brushing away as much paint as possible, apply water and a stain remover or detergent. Gently rub it into the spot, and use the brush to remove the remaining paint.
https://www.reference.com/home-garden/remove-spray-paint-clothing-ab731f2a21b797e0
You were very kind to research that for Keyhopper, but I am pretty sure Key was just making a little joke. He claimed that graffitist in his area was spraypainting “Q” all over town. When Key asked about removing the paint from his jeans he was implying that he was the “Q” painter. Get it?