From my 1994 Southwind owners manual:
RUBBER ROOF SYSTEM
Cleaning
For normal cleaning standard household detergents or cleansers may be used. Use a non-abrasive, common household detergent and plenty of water. Be sure to keep the sidewalls wet to reduce streaking. Road tar, tree sap or other stubborn stains can be removed with a soft rag and xylene.
Care
The rubber roof itself does not require annual coatings or additional sealants. Periodic washing with soap and water is all that is required.
Do the math. Mine is coming up on 22 years of age. Still looks good with no signs of deterioration. I am the third owner and it has been kept inside by myself and previous owners. I'm sure that makes a big difference in condition.
