I think the things you've listed are probavly the easiest - highchair and benches ca be wiped down with simple hot soapy water. Floors with hot water and a capful of eucalyptus oil.

People think that the only way to really clean things is with disinfectant or smelly chemicals, this isn't true at all. I try to think back to what my grandmother would have used to clean her house, and go from there.