Possible Clues:

• Pull out all the stops
• Make every possible effort in Lorna's flat first?
• Try everything Steve Bell's done, including old works
• Make the maximum effort, Lorna's flat second to none
• Strive to surpass all others cleaning own storey?
• Try really hard
• Make every effort, even stopping Lorna's defeat
• Go flat out?
• Make a maximal effort
• Go all out to make Lorna's flat most desirable