Just had a call, paint to remove from a draylon headboard, not to much of a problem

stairs and landing, 3 bedrooms and.............. asked if i could sanitise the block paving , as it was flooded in the recent floods and require it doing,
any suggestions please, i was thing of along the lines of a rotory scrubber with a solution tank , but just puzzled as what to actually use
not to sure if bleach , or a plain old patio cleaning product will do

Geoff