disinfectant? nooooo - you need to use pure bleach!
seriously though, tis only a bit of poo - drain the bath, clean it out, shower DS down or re bath and give the toys a good wash in dishwasher or just use washing up liquid or a bit of disinfectant for the TOYS
i was actually aiming that at the people surgesting he go in the dishwasher or microwave and bleach. it was blatently obvious the op was probally at the end of her tether and probally needed a more supportive approach than those surgestions