如何表达去厕所

如何表达去厕所
I need to go somewhere.我要上厕所。
I want to wash my hands.我要上厕所。
I need to answer the call of nature.（文雅说法）我想上厕所。
I need to go pee.或I need to take a leak.或I need to take a dump.（较为粗鲁）我想去厕所。