Wash the Toilet = Flush??

A few days ago, I saw a slogan saying "Please wash the toilet after usage" (便后请冲水).Shouldn't it be "Please flush the toilet after use"? In my opinion, "washing the toilet" means someone - such as a house keeper - cleaning the toilet. Is it correct? Could any English natives kindly help? Thanks a lot!

<em>[Very good.  You are correct.  Unless this is a very unusual situation, the sign should say "Please flush toilet after use."]</em>

Wash the Toilet = Flush??

A few days ago, I saw a slogan saying "Please wash the toilet after usage" (便后请冲水).Shouldn't it be "Please flush the toilet after use"? In my opinion, "washing the toilet" means someone - such as a house keeper - cleaning the toilet. Is it correct? Could any English natives kindly help? Thanks a lot!