Tiktok, you are right. I spent yrs expressing and never had to sterilise. I just brought in my mini pump and a bottle or two, expressed and then popped it into the staff fridge in a bag.
If I did two expressos during the day (if I worked late for example), I would just give the equipment a very thorough wash with hot soap and water between the sessions.
A lot of employers have a quiet room/large storage cupboard/empty office for the day and if I was off site, there would always be someone very happy to lend me their office for 15/20 minutes at lunchtime.
If our quiet room was occupies I would sit in the CEO's storage cupboard, next to the hampers and crates of champers
- quite cheery
If I was busy at work, I would take some reading material in with me, so at least I could get some work reading done without being disturbed :)
BTW, for anyone who thinks BF Mums are "skivers" (a la Scrooge/northerngirl) I was in the top 10% of employees that year for work performance