We washed our rig to check the seams and roof for leaks. Preventative maintenance is the best way to avoid costly repairs later.
The Caulking we use of the RV is

Roof Caulking https://goo.gl/9EUjy1
Wall and Seams https://goo.gl/FUwQem

EPDM RESEAL https://goo.gl/D3B1A7

RV Soap (Tide) https://goo.gl/Zz32Xt

Don’t use the wrong kind of caulking it will come off over time and or crack because it will not stretch the same way RV caulking does.