Wouldn't it just remove all cum if she sees that as dirty? That is atleast how I remember understanding the [Clean] spell from when it got introduced in the manga...
He just prepared because he didn't know it. It was the week before this (in story) and he had made it before that.
He made it at the start of May, during Golden Week.
We can know that because "long break in may", "raining season have just begun" was both said this chapter.
The raining season...
True, I was also thinking about it and found out it can be right if she is from the most northern top of Finland because that is part of the Scandinavian Peninsula.
Its also right right if they just used Scandinavia as the catch-all/synonym for the "Nordics" which is common in the English...
I think the reason people don't know that he is an S-rank (former) is because he went up so fast, worked so hard, and never cared about fame... He only worked because we know he only did that because that was the only way he thought of that he could get a job, then he got a gf (the girl who left...