• Do spot DX you have worked or heard when tuning the band for the benefit of all.
• Do use the DX cluster to help you find DX during the contest.
• Don't use the DX cluster to help the DX find you.
• Don't ask other stations that you work to "please spot me"
• Don't spot DX you've just worked on your frequency.
• Don't spot your fellow team member (if operating in team/multi band contests eg UKAC, AFS, VHF NFD etc).