PowerWash Simulator

There is a red X on the street in front of the gas station. Stand on this at any point in the level and the achievement will pop after a little animation plays out.

While it is possible with the starting washer, it is much easier to achieve this with the UrbanX U2.

After cleaning the time machine, wait a minute for it to come back.

Make sure you're facing the area it dissapeared from just in case. When it returns, it will be out-of-bounds next to the "photo hut" building (in front of doc brown's van).

Run inside the building and up the stairs. Interact with the hammer next to the bell to get this achievement (it doesn't need to be clean or anything).

Stand on the red "X" (near the red car) and look towards the corner with the hologram projectors.