If ya use a little more virosan it wont hurt, remember they use it for dental surgery and right on said animals so I don't think a little to much is bad or that ya have to be prefect
I buy the small bottles, for now, from ProExotics and they look to be around 2oz and they sent a standard size spray bottle and marked on black line almost to the top where the bottle narrows for water and add the 2oz bottle.
If ya follow Marla's formula I think your good.
Virosan Rocks! No wipe no fuss no muss
Water bowls etc you do want to rinse