I couldn’t verify a definitive in-game method for Clean the Store from the results I found, but the most likely way to get the shopping cart is to look for it as a map pickup or unlock tied to a task, since Roblox guide videos for cart-finding games usually place collectibles in specific zones marked on the map or near teleporters.

What to try

  1. Check the store’s main shopping area first, especially around the center aisles, stairs, and entrances, because cart-type items in Roblox games are often placed in obvious hub locations.
  1. Open the in-game map and look for a cart icon, objective marker, or a highlighted zone, since guide videos often rely on the map to narrow down the spawn area.
  1. Walk around teleporter-adjacent or side areas if the main floor doesn’t have it, because collectible-style items are frequently hidden just off the main path.
  1. Rejoin the game if progress seems bugged, since some Roblox collectible systems reset or change placement on rejoin.

Likely situation

If you mean a specific cart item rather than the Roblox catalog shopping cart, the game may require you to complete a quest or collect several items before the cart appears. The search results I found point more strongly to a “find the shopping carts” style Roblox experience than to a standard shopping- cart mechanic inside a store-cleaning game.

Best next step

Search the game’s description, update notes, or a recent walkthrough video for the exact objective name, because “Clean the Store” may have a cart unlock that is hidden behind a newer update or a renamed quest.

TL;DR: The cart is most likely either a map-hidden pickup in the store area or a quest unlock, and the best places to check are the center of the store, side zones, and any teleporter-linked areas.