Remove the window and use
#1) 6 mm Butyl Tape (Automotive Industry) or
#2 use the gray building putty they used to use this on windows in the RV industry.
Nowadays it is a rubber seal or foam seal, lot of time installed poorly
I have done one window with butyl tape and going to do them all coming spring.
2014 Ram 1500 CrewCab 4x4 5.7 Hemi 3.92 Rear and Air Lift 1000
2005 Jayco Jay Feather LGT - 29Y GVWR-6500 lbs.
Pro Series 1200 lbs. WDH with Double Sway Bar.
Champion 3100/2800 watt Inverter/Generator-Onboard Solar Power
ALJO 'Forever Young @ Heart' provide on their travels Music Entertainment to Senior Care Homes