"去卫生间"的最最礼貌的说法?

i'd like to go to the rest room.
rest room 是比较文雅的说法

女
Excuse me男女
Excuse me, I need to go to the bathroom.
Excuse me, I need to go to the Loo.
Excuse me, I need to go to the restroom, I need to go to the Toilet.
Excuse me .
Excuse me, I need to go to the washroom.
Excuse me, I need to go to the powder room,I need to answer the call of nature

Excuse me, I'll have to wash my hands.
Excuse me ,the nature calls. (大自然召唤,也就是要上厕所了)
Excuse me, I need to go to the rest-room.

有一种说法，是I want to go to somewhere.
这里的somewhere表示的是卫生间.

excuse me for a moment (雅)
I'll be right back
please wait for me
nature's calling
I need to use the facilities
where's the bathroom? （常用）
which way should I go?
Where can I find a restroom?

go to the washroom

I am going to wash hands.

pick a flower (female)
add some powder (female)

I have to go for awear.美式的俗语，这样说很地道。

Hear the nature's call.

I have to go.