Due to its incredibly fast reproduction rate Covid-19 requires a dedicated cleaning and Hygiene regime which should include the use of cleaning materials approved to EN14476 against enveloped viruses as defined in EN 14476:2013 and A2:2019 including 2019 n-Cov / Sars-Cov-2
Droplets from coughing, sneezing and even speaking may spread the virus a short distance where it can remain on surfaces for days so fogging now being a more commonly used method of fighting Covid-19 should really be a part of your regular sanitation and decontamination process.
The Hurricane ES being perfect for high touch surfaces produces droplets with a negative charge which repel each other giving better dispersion and coverage whilst making stronger and quicker contact with surfaces compared to droplets from standard non-electrostatic foggers. https://hygiene-solutions.shop/product/hurricane-electrostatic-fogging-machine/
For the cost of one fogging deep clean provided charged by your contractor you can purchase the Hurricane Electrostatic fogging machine for use in a cost-effective targeted way by your own staff to continuously fight the virus throughout your school.
All you have to do then is to decide what to do with the money you save.