In Roblox Bid Battles / auction-style games , “cleaning” usually means using the repair/cleaning station on dirty or damaged items before grading or selling them. A useful forum-style answer would be: go to the repair shop, interact with the cleaning machine or NPC, and use the item on it until the dirt/damage is removed.

How it usually works

  • Find the repair shop or cleaning area in the map.
  • Bring the item you want to fix to the station.
  • Interact with the cleaner/repair tool, then wait for the process to finish.
  • If the item still won’t clean, try leaving and rejoining the server, which players report can fix glitches.

Common mistake

A lot of players confuse the repair shop with a locked or higher-level area nearby, so if you cannot enter one building, it may be the wrong place.

Small note

The search results I found were clearer for repairing items in Roblox auction games than for a game literally called “Auction Simulator,” so the exact steps may vary by the specific Roblox experience.

TL;DR: In most Roblox auction/repair games, you clean items by taking them to the repair/cleaning shop and using the cleaning station on them.