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Most spray paints are oil-based, meaning you will need a solvent to dissolve them, like paint thinner, lacquer thinner, or acetone. While solvents can be useful in removing paint, they are also very flammable and require the use of a respirator. Beyond that, these products may smear paint and cannot be used on all surfaces.

Some homeowners have luck using pressure washers, but this only works for old or weaker concrete sealants and with very powerful pressure washers. You’ll get better results by pressure washing water-based sealants. However, it’s worth trying on any sealant if you’re hoping for the least toxic, least expensive, and most DIY-friendly option. To try this method, rent or buy the most powerful pressure washer you can find and take several passes at the concrete, completely pressure washing the entire area. You may need to repeat the process multiple times to see results.

The most common reason paint peels is because moisture gets trapped underneath it and disrupts its bond with the wall. Other causes for peeling paint include a poor original paint job, painting over a surface with dirt or other foreign material on it, or applying paint coats that are too thick.

Penetrating sealer seeps into concrete pores to protect it from moisture and staining, cracking, and mold caused by water. This means you cannot remove penetrating sealers like topical sealers. The good news is that penetrating sealant doesn’t have to be removed before resealing, as most topical sealers must. Instead, you’ll want to buy a compatible penetrating sealant (often the same kind already in the concrete) and apply it. Always follow the manufacturer’s instructions.