Hi Orpheus,

Welcome to the IFSQN forums.
Your environmental monitoring programme should include micro swabbing for indicator organisms and pathogens:
TVC
Enteros
Y&M (these are also spoilage organisms/toxin producers)
Salmonella (normally dry environments)
Listeria monocytogenes (normally wet environments) or Listeria spp (& check for monocytogenes if positive).
Limits can be established from historical data identifying standards to be expected when everything is in control.
The difference between post clean and during production will not be what tests you apply but the limits. For example a clean surface may be <10 cfu/cm2 whereas during production <1,000 cfu/cm2 may be acceptable.
Kind regards,
Tony
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