Water Ingress Due to Insufficient IP Protection in a Clutch

Hello everyone. I am using this magnetic particle clutch on a food packaging line, where it is subjected to daily high-pressure water washdowns.

Although it is rated at IP65, water managed to get inside after just six months of use, causing the magnetic powder to clump and leading to a loss of torque control. Upon disassembly, I discovered that the sealing lip at the shaft end had worn down, allowing water to seep in along the output shaft.

I replaced it with a double-lip seal; while this provided some improvement, water still manages to penetrate during high-pressure washdowns. I would like to ask for advice: how should a clutch be protected in an environment where food-processing machinery undergoes high-pressure cleaning? Is an IP69K rating required, or should I install an additional protective cover?

I look forward to any expert insights on how to resolve this issue.