My daughter loves bath time, thankfully we haven't had a poop accident yet, but she has peed in the tub. I sanitize the tub before and after use. We use vinegar, water and lemon mix that's all natural and doesn't leave a chemical residue that could make her get a rash. I have used water and bleach to give a good clean scrub but use the mixture after to get all the bleach off.
Both of us have sensitive skin so that is what has been working for us, but I have seen the lemongrass stuff before at Target, just haven't tried it.