Depends on what you looking for. For general microflora, like TVC and Enterobacteriaceae, you can use PCA. For yeasts and molds (since you do have moisture that can support their growth on surfaces) DRBC is generally good. For Listeria Half-Fraser. Lastly for Salmonella you can go either PCA or Buffered Peptone Water.
The mediums I mentioned are the broth you are going to have in the tubes that you will place the swab, before you send it for analysis.
You can generally go with PCA for all of the above mentioned, except for Listeria (I strongly recommend the selective medium for this one), so that you don't have all these different mediums.