I went to a laundrette for a service wash (where they wash and dry it for you). I had several loads, and not knowing their machines, or how much they'd need, I gave them my bottle of detergent to use on MY wash.
When I got home, I realised the bottle was almost empty! I'd only used it once before. AIBU that they clearly used my detergent on their whole days washes?
I now realise I shouldn't have left the whole bottle, but do you just send in a jar of detergent? What is the norm?