There was a study published in the Journal of Small Animal Practice that used fluorescent tagging for environmental surface cleaning surveillance at a large US veterinary hospital. A total of 4984 surfaces were tagged and assessed. Overall cleaning was found to be only 50%! *1

This study found that key surfaces in the small animal veterinary practice are unlikely to be adequately cleaned, posing a concern for animal and human health.*1

Another study found that 16.3% of dogs and 12% of cats were reported to have had ≥ 1 nosocomial infection occur during hospitalization.*2

Fluorescent marking can be used to improve practice hygiene and infection control by identifying if cleaning procedures are efficient, making it an invaluable teaching tool also. 
Fluorescent dye is used to tag surfaces, the dye is invisible to the naked eye and is easily removed by regular cleaning.  A UV torch can be then used to access if the tag has been cleaned away. 

The use of a fluorescent marker system in ICU resulted in 40% more surfaces being cleaned.*3

*1 https://onlinelibrary.wiley.com/doi/abs/10.1111/jsap.13090?af=R
*2 https://pubmed.ncbi.nlm.nih.gov/24134779/
*3 https://gama.getbynder.com/m/02409f0f472796f2