I think Scandinavians my age know "ei sa peittaa". Basically "do not cover". When bored on the toilet before phones, reading whatever labels was the norm, and they often had a Finnish version. This was the label on the radiator.
I've visited Finland a lot the later years due to my company starting a fulfillment center there. It was quite interesting how well I could get by with my Norwegian most places. Either because signage also was in Swedish, words often similar enough (except those that are very very far off, lol), or I even could speak Norwegian to some coworkers that then replied in Swedish (and not all of them even being Finns with Swedish as their native language).
For a brief attempt at a Finnish webshop I also happen to know "Osta Nyt" (Buy now) and "Verkkokauppa" (Online store).
So you know a bit more Finnish than you thought!