Can you use hydrogen peroxide to clean quartzite countertops?

Yes, hydrogen peroxide is safe on quartzite and works well for stubborn stains. The 3% solution from the drugstore won’t damage the stone or your sealer. It’s what fabricators recommend for organic stains that soap alone can’t lift — think coffee rings or berry juice on a light surface. For surface stains, spray it on, let it sit two to three minutes, then wipe with a damp cloth. For deeper discoloration that’s soaked in, mix the peroxide with baking soda into a thick paste, spread it over the spot, cover with plastic wrap, and leave it overnight. The paste draws the stain up through the pores. Stick with the drugstore 3% bottle and skip anything stronger.