The US Environmental Protection Agency recommends a wide range of disinfectants to be used against SARS-CoV-2:
https://www.epa.gov/pesticide-registration/list-n-disinfectants-use-against-sars-cov-2
Of those, the following are recommended from the manufacturer for use on plastics for Medela Healthcare products:
- Oxivir® TB, Oxivir® 1 from Sealed Air Diversey Care
- Virex® II 256, from Sealed Air Diversey Care
- Clorox Healthcare® Bleach Germicidal Cleaners and Wipes from Clorox