Name	Lifeboat from Titanic	Lifeboat to Carpathia	Confidence Level
Harder, Mr William	14	4, 10, 12, D	5.00

British Inquiry
Testimony of Joseph Scarrott
   403. Am I right in supposing that in your boat, No. 14, there were yourself, two firemen, three or four stewards, and Lowe? - There is a correction there, my Lord. There was one man in that boat that we had been under the impression - when I say “we,” I mean the watch of sailors - that he was a sailorman. That man was not a sailor at all, though acting in the capacity of sailor. That was another man that was in the boat.
    404. What was he? - A window-cleaner; he was supposed to be in the ship as a window-cleaner.

William Harder was the only window cleaner who was rescued, therefore, must be the man Scarrott is talking about.  Harder does not appear to be one of the crew aboard when Lowe took the lifeboat back to the wreck site looking for survivors, so we don't know what lifeboat he may have transferred to - #4, #10, #12 or Collapsible D.