Privium Airside Lounge

www.airtravelgenius.com

Privium Airside Lounge – Privium also has a small lounge past security on Holland Boulevard near pier E (non-Schengen zone). At 350m², it features seating for 54 passengers, food and drink offerings, free WiFi and has decor of North Sea beach scenes. The Privium Airside lounge can also be used as an arrivals lounge by members with a valid arriving boarding pass.

This lounge has provisional status and the area may be renovated in the future. Open 0600-2100 daily.

21時が夜遅くに入るかと言うのはかなり疑問ですが。
馬鹿高い会費を払えば入れます。

しかし、その下の、

Showers at Amsterdam Schiphol Airport
If you are looking to freshen up and take a shower whilst at Amsterdam Schiphol, there are the following possibilities:

KLM Crown lounges (you need to have access)
Aspire non-Schengen Lounge 41, shower costs €20, towels provided (plus you need to have access to the lounge).
Free shower in one of the toilets at non-Schengen departures, upstairs near the airline lounges. Bring your own soap and towels.
Mercure Hotel Schiphol Terminal, located at Lounge 3 (upper level) near the F gates (non-Schengen departures) and opposite the KLM intercontinental Crown lounge. It charges €15 for a shower including towels and soap. Alternatively book one of the rooms there. Open 24 hours.

にははいっていない。ただし、出発客を対象にしているだけかも知れません。

日本から汗だくで出発しているので、綺麗なからだになりたいのですよね？

やはりホテルに泊まるのがからだを清める近道でしょう。