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It’s best to use a slightly slower-working paint remover that is safer to use, such as mineral spirits, because the strongest spray paint removers are often also the most toxic. Many of these products contain dangerous chemicals, such as methylene chloride, which the EPA banned for most uses in April 2024 after it was established as a major carcinogen.

Yes, WD-40 can be used to remove dried paint, including spray paint, from surfaces like metal because it acts as a solvent. To use this method, spray enough WD-40 to completely cover the paint and let it sit for five to ten minutes. Afterward, gently scrub the area with a cloth to remove the paint. Be aware that this method might leave behind a greasy film that can attract dirt.

The best and fastest way to remove paint from a deck often involves combining a chemical stripper with a pressure washer. Gel-based paint strippers are highly recommended because their thick consistency makes them less messy and easier to apply than liquid strippers. After applying the stripper to loosen the paint, you can use a pressure washer to efficiently wash away the residue. When using a pressure washer for this task, it's important to use a low pressure (under 1000 PSI) to avoid forcing too much moisture into the wood, which could lead to mildew or rot.

Think hard before deciding to German schmear your home’s exterior brickwork. If you do not like the look, you are pretty much stuck with it, as it is impossible to remove this finish the way you can remove paint. You risk damaging the underlying brick if you have to chisel and acid-wash it away. It will also take a very long time, and remnants of the mortar wash will always remain.