How do I get paint off fireplace bricks and stones and grout?

Have you tried paint thinner?

https://www.youtube.com/watch?v=0fj3W2otrs0

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Try paint thinner

Try a wire brush

not an easy task.. stone and brick are POROUS, unless sealed properly they both absorb them like a sponge.. You will never get it all off Other than sandblasting. which will more than likely destroy the mortar.. Been there tried that.. what a mess only to paint over it.. If its small areas like a spatter or two a wire brush- depending on the type of paint..