In our opinion, the stronger the smell, the dirtier a surface would have been in the first place.
For example, a healthy chlorinated pool can emit a light chemical odour, especially if it is an indoor pool and one with less than ideal ventilation. The stronger the smell of chlorine, the more bacteria the chemical has eliminated, thus being dirtier before treatment took place.
Solvic in its purest form is odourless, the odour/bleach smell only generates when the liquid comes into contact with germs/bacteria/proteins, generally any filth.
This causes the reaction and creates combined chlorine. The liquid reacts with proteins and organic matter. Once you smell the “chlorine” smell, you know the reaction has been made and the surface/area is clean.