Volvo P1800 Clutch Reservoir Leak

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I noticed that the clutch reservoir of my Volvo P1800 is always having some yellowish crystals on it. I suspected leakage from the connector that caused the dot 4 fluid to come out.

While servicing the leakage of the air vent of my car, I asked the mechanic to help me tighten the nut on the connector, and it turned a bit. I then cleaned it up using WD40. The dot4 brake fluid used in the clutch reservoir is very corrosive to paint.

Did the above 2 days ago. Today i checked the reservoir, it looks clean.