It depends upon what material your roof is covered with. If you aren't sure you can email Jayco with your VIN number and they will check your trailer's work order. They even emailed me the manufacturer's reccomended care and cleaning directions. For my Dicor roof it basically says any mild, non abrasive, all purpose cleaner will do (Spic N Span, Top Job, Mr Clean, etc.). 2 to 3 times per year.
'13 Ford F 150, FX4 Off Road, Ecoboost
'15 Jayco Jay Feather X213 BH