Lantern Hunter Achievement in PowerWash Simulator

In the Treehouse level there are 12 lanterns which must be sprayed before you do anything else. Here's where all 12 are:
 

• You'll find 2 as you start up the level, on the stair posts, which lead up to the lower deck.
• There's 1 on the middle deck, on the tree, behind the research table.
• There are 8 hanging down from underneath the rim around the house at the top.
• And finally, there's 1 at the bottom of the winding staircase on the railing, the staircase that leads down from the house at the top.