If you mean delete blocks in Roblox Studio , the quickest way is to select the parts and press Delete , or use Explorer to remove the whole model/folder if all the blocks are inside one group.

Fast ways

  • Click a block in the 3D view, then press Delete.
  • In Explorer , select the block, model, or folder and delete it there.
  • If you want to remove many blocks at once, select them all first with multi-select and then delete them together.

If you mean “unblock” a user

Roblox Support says to go to Account Settings → Privacy & content maturity → Blocked users , then select Unblock next to the person and save the change.

Helpful note

If you are scripting block removal in a game, Roblox forum advice suggests deleting the parent folder when possible, or destroying parts in batches to avoid lag.

If you meant ghost blocks in a Roblox game like BedWars, that is a different thing entirely.