If the headlights on/off are controlled by a rotating dial, try (gently) pulling on it away from the dash, to see if that wakes up the foglamps. If you have the owner's manual for the chassis, that info should be in it somewhere, or it might be in the motorhome owner's manual.
Some soaps that contain citrus type additives, are often not recommended for use on headlight lens covers. They cause them to turn opaque with repeated use.
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2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)
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