Indoor concrete: clean your concrete surfaces using warm, soapy water. Wipe up spills immediately, as acidic or caustic substances like mustard, vinegar or bleach that sit on the surface for a long time can attack the surface sealer. Do not use an abrasive or chemical cleanser as this can scratch the surface or impact the seal. Reseal your concrete annually. Outdoor concrete: exterior concrete should be protected from winter freeze/thaw cycles as best as possible. Move pieces indoors for winter if feasible. You can also cover your piece with an impermeable sheet or raise it off the ground if possible. Concrete planters should have stones placed at the bottom before adding soil to ensure adequate drainage.