Starsan's great for bacteria. *hite for wild yeasts,,, I use CELLarMATE 650mg (Sodium Dichloroisocyanurate by Chemisphere uk ltd) tablets 1/2 tablet 2.5l then rinse, rinse, rinse, sniff, as Steve advises. Then Starsan (don't fear the foam!) I use my waste CM to sanitise our loos etc after.
Do not under any circumstances mix chlorinating sanitisers and Starsan (phosphoric acid) always between rinse, rinse, rinse,,,sniff!
CM is my universal cleaner at differing strengths, but then Starsan all the way (without rinsing:thumb:) combined it all works!
I use surface swabs with agar cultures for bacteria and wild yeast detection. After full sanitising (as above) My last swabs were clear! phew,,,